Column drag resizing not matching cursor's movement

Hello! I am a TanStack table begginer using React. I have implemented a custom resizer handle. I feel confusing that the amount of distance that the mouse is moved does not match the column size. I don't know how to explain it properly, but in the gif you can see that the column ends in a smaller position than it should be, it does not fully follow the cursor...
Is this behaviour customizable?