Centering a Sunokey Prusa I3

Guys (and Gals), I've searched everything I can think of, but can't find an answer as to why my Sunokey Prusa I3 will not print on center. Hasn't been a big issue until now. I'm trying to print a 208mm object the will fit if I print it at a 45 degree angle on the bed. The problem is that my Prusa I3 thinks that center is 2: off of center. Any ideas?

Thanks in advanced!!

Edit: Attached is what I'm talking about....

Edited 2 time(s). Last edit at 09/18/2016 09:20PM by CatMan42.

Your slicer has the wrong bed size?

Just double checked, X=200mm Y=200mm z=180mm. It's set up correctly.

Your endstop set correctly? your firmware configured correctly? was the model definitely centered in the slicer?

Try telling it to go to 100, 100 and see if that is center. Also check 0,100 and 100, 0. This should highlight the problem anyway.

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If you need some help, or don't understand what I just said, feel free to send me a PM anytime

Printer: Prusa i3, 2 E3D v6 Hotends, Arduino + RAMPS 1.4 with a Bypassed 5V Regulator, 400w Insignia ATX PSU, Custom Designed Bowden Extruders