Accuracy

Recently I had to cut 10mm holes and when my CNC cut them, holes were 9.5mm. 

I use Fusion360 and I've tried drill operation, 2D adaptive clearing, stock to leave=0, all of it. Same result.

I even tried to set feed rate ridiculously slow but the the hole is always the same...

When I cut bigger holes, it's accurate. Only small holes. 

Any suggestions?

Tnx