battle sprite corruption

Those first two patches might be conflicting with each other...but wait, what summoning patch are you talking about exactly?

Have you applied any other patches before those two? And most importantly, did you make sure to see if you needed to patch with a header/headerless ROM? Sounds like this may be the problem, you got to make real sure to patch correctly or there will be disastrous consequences.

Also, have you made any monster/Esper sprite changes in the sprite editor right around that time? Try opening it up to see how much damage it did, to maybe put back the sprites that were damaged - but honestly if there are no anti-patches, I'd get rid of that ROM and either start over fresh, or hopefully you got a backup right before you went and applied the patches. You...did make a backup before applying patches, right...??

Maybe try applying the first two patches one by one on a backup, and see if when you apply the 2n'd one if it causes the problem. Either you're not patching them correctly, or they conflict with each other.