Hello, @32.enjoythelittlethi, 
welcome to the community. This is a common issue here. Might I suggest taking a look at this thread and following the directions I gave. It helped this person to achieve perfect cuts, maybe it will help you. It could be happening due to the offset you’re using. Hope it helps. Let me know if it does. Have a great day.
P.S. Don’t be scared by the preview, the instructions I give are in English. 