Geeetech

I'm new to the 3D Printing world. I have an A10 setup and it prints just fine, but when I HOME the print head, it is about 10mm off the glass bed in both x and y. I have the bed dimensions set to what the factory recommends at x220 y220 with center at 110,110. When I print something it's not in the middle of the bed.

How do I correct this?

BrentHG