I'm not new to 4x5, but I have recently acquired my first Anniversary Speed Graphic. I am having problems getting my image in focus. I have no problem getting the image in focus on the ground glass, but on my fp100c image the focal plane had shifted to the foreground. I double checked that the focus didnt change as i was switching out my back, and it did not move.

I'm using a fuji PA145 back
ground glass has no fresnel or shims.
ground glass has frosted side toward lens
camera is mounted on a solid tripod that doesn't move (image is still sharp, just moved to foreground)

Any suggestions?