HashCode randomly changing on structures.

I've never in my career of coding have seen the behavior I'm about to describe so I'm hoping to learn something new... this is Unity3D btw...

In my code I am iterating a collection built on creation. I've confirmed that the objects are not being rebuilt at any time, and also the GetHashCode shown in this segment returns the same every time. The code below does not really matter a whole lot, just showing my work flow.

                for (int i = 0; i < _rigidbodyDatas.Count; i++)
                {
                    Debug.Log("Changing kinematic on " + _rigidbodyDatas[i].GetHashCode() + " to " + isKinematic);
                    if (!_rigidbodyDatas[i].SetIsKinematic(isKinematic))
                    {
                        _rigidbodyDatas.RemoveAt(i);
                        i--;
                    }
                }

                for (int i = 0; i < _rigidbodyDatas.Count; i++)
                {
                    Debug.Log("Changing kinematic on " + _rigidbodyDatas[i].GetHashCode() + " to " + isKinematic);
                    if (!_rigidbodyDatas[i].SetIsKinematic(isKinematic))
                    {
                        _rigidbodyDatas.RemoveAt(i);
                        i--;
                    }
                }

This is the SetIsKinematic method....

            public bool SetIsKinematic(bool isKinematic)
            {
                if (_rigidbody == null)
                    return false;

                if (isKinematic)
                {
                    _velocity = _rigidbody.velocity;
                    Debug.Log("Cached velocity as " + _velocity + " on " + GetHashCode());
                    _angularVelocity = _rigidbody.angularVelocity;
                    _rigidbody.isKinematic = true;
                }
                else
                {
                    Debug.Log("Read velocity as " + _velocity + " on " + GetHashCode());
                    _rigidbody.isKinematic = false;
                    _rigidbody.AddForce(_velocity, ForceMode.Impulse);
                    _rigidbody.AddTorque(_angularVelocity, ForceMode.Impulse);
                }

                return true;
            }

            public bool SetIsKinematic(bool isKinematic)
            {
                if (_rigidbody == null)
                    return false;

                if (isKinematic)
                {
                    _velocity = _rigidbody.velocity;
                    Debug.Log("Cached velocity as " + _velocity + " on " + GetHashCode());
                    _angularVelocity = _rigidbody.angularVelocity;
                    _rigidbody.isKinematic = true;
                }
                else
                {
                    Debug.Log("Read velocity as " + _velocity + " on " + GetHashCode());
                    _rigidbody.isKinematic = false;
                    _rigidbody.AddForce(_velocity, ForceMode.Impulse);
                    _rigidbody.AddTorque(_angularVelocity, ForceMode.Impulse);
                }

                return true;
            }

What's strange is whenever

_rigidbody.Velocity

_rigidbody.Velocity

(a structure) contains value the GetHashCode returns different. EG: if

_rigidbody.velocity

_rigidbody.velocity

Vector3.zero

Vector3.zero

the hashcode is the same as what was called during the loop, but if it differs the hashcode does as well. I've found simply changing the struct to a class resolves the issue but I'm not sure why.
The

read velocity

read velocity

segment also always has the correct hashcode either way.

HashCode randomly changing on structures.

                for (int i = 0; i < _rigidbodyDatas.Count; i++)
                {
                    Debug.Log("Changing kinematic on " + _rigidbodyDatas[i].GetHashCode() + " to " + isKinematic);
                    if (!_rigidbodyDatas[i].SetIsKinematic(isKinematic))
                    {
                        _rigidbodyDatas.RemoveAt(i);
                        i--;
                    }
                }

                for (int i = 0; i < _rigidbodyDatas.Count; i++)
                {
                    Debug.Log("Changing kinematic on " + _rigidbodyDatas[i].GetHashCode() + " to " + isKinematic);
                    if (!_rigidbodyDatas[i].SetIsKinematic(isKinematic))
                    {
                        _rigidbodyDatas.RemoveAt(i);
                        i--;
                    }
                }

This is the SetIsKinematic method....

            public bool SetIsKinematic(bool isKinematic)
            {
                if (_rigidbody == null)
                    return false;

                if (isKinematic)
                {
                    _velocity = _rigidbody.velocity;
                    Debug.Log("Cached velocity as " + _velocity + " on " + GetHashCode());
                    _angularVelocity = _rigidbody.angularVelocity;
                    _rigidbody.isKinematic = true;
                }
                else
                {
                    Debug.Log("Read velocity as " + _velocity + " on " + GetHashCode());
                    _rigidbody.isKinematic = false;
                    _rigidbody.AddForce(_velocity, ForceMode.Impulse);
                    _rigidbody.AddTorque(_angularVelocity, ForceMode.Impulse);
                }

                return true;
            }

            public bool SetIsKinematic(bool isKinematic)
            {
                if (_rigidbody == null)
                    return false;

                if (isKinematic)
                {
                    _velocity = _rigidbody.velocity;
                    Debug.Log("Cached velocity as " + _velocity + " on " + GetHashCode());
                    _angularVelocity = _rigidbody.angularVelocity;
                    _rigidbody.isKinematic = true;
                }
                else
                {
                    Debug.Log("Read velocity as " + _velocity + " on " + GetHashCode());
                    _rigidbody.isKinematic = false;
                    _rigidbody.AddForce(_velocity, ForceMode.Impulse);
                    _rigidbody.AddTorque(_angularVelocity, ForceMode.Impulse);
                }

                return true;
            }

What's strange is whenever

_rigidbody.Velocity

_rigidbody.Velocity

(a structure) contains value the GetHashCode returns different. EG: if

_rigidbody.velocity

_rigidbody.velocity

Vector3.zero

Vector3.zero

the hashcode is the same as what was called during the loop, but if it differs the hashcode does as well. I've found simply changing the struct to a class resolves the issue but I'm not sure why.
The

read velocity

read velocity

segment also always has the correct hashcode either way.

HashCode randomly changing on structures.

HashCode randomly changing on structures.

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