Please post or email a 'catalyst support PDF profile' - this will tell us a lot more about your system - the cards in use etc...

It certainly looks like an SDI sync issue - may be before catalyst.?
You need to test as suggested above with a moving test image to diagnose.
Try each input one-by-one and then all as per your show setup.
What happens when you un-plug and re-plug the signal innput?
Are you using any SDI isolation between Card and PPU?

If the rest of the image is consistently ok - then maybe use Phil's suggestion of cropping 10pix off the top...

S