I am thinking that your grid snap is on.
Is there a little black dot jumping around near the cursor?
If so try to turn that off - I thing the default keyboard shortcut is 'S'.
Or you will find it in the "View" menu.
Barry.
One of the forum moderators.
Versions 6.5 to 27
i7-10700 @ 2.9Ghz, 32GB ram, GeForce RTX 2060 (6GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11