Hi Gotz,
Yes, it appears to be related. I had manually set the pixel size to 0.02 for my orthos. After reading the thread you linked to, I set the pixel size to 0.0199 on the orthos that didn’t match up. Changing the pixel size to 0.0199 did the trick. There seems to be some kind of mathematical error related to the orhto pixel size.
Thanks for posting that link. 