z tilt issue

So I think I almost have my printer fixed except 1 issue. Its kinda odd, but here is what is happening
Once I get bed leveled old fashioned way, and do probe_calibrate I kick off z tilt.
Comes to front left, fine
Moves to back all is fine
Then moves to the front right and does the initial probe...BUT and ONLY on this step when its lowering the bed to move over to the front left 2 of the 3 z motors stop, the front right seems to lower another 1/2 to 3/4 rotation.
The motor does NOT do that on any other steps.
I have not replaced or changed anything related to z motors outside of replacing the board and drivers.
If it would do it on every step I'd replace driver it just seems odd that it only does that at that specific time.
Thanks
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