Collimation Meade SCT 12" issue

Group,
I have owned several SCT's over the last 4 years, but this one is more of a problem than the others.
It's collimation. I most certainly know how, the issue is that through any lens the center of the image is clear but the circle/edges are not collimated.
Is it possible this scope was built with the corrector plate installed backwards?

What eyepiece(s) are you testing with? You are saying that when you look in the eyepiece, only the center of the field of view is sharp? I don't think a reversed corrector plate would do this.