Sorry, this is an emulation bug of 3DNes ...
Viewing post in Punch-Out!!
No problem. I am having a lot of fun with this.
There is another bug I noticed in Punch-Out. Sometimes when changing the pattern on a character sprite, one part of it will just disappear. If you delete the sprite, it will come back, but only to disappear again if you edit it. It happens most often with the faces of characters. It seems to have something to do with this white sprite block the developers put behind the character faces occasionally to make the eyes and/or mouth white. I have a video of it if you need to see it.
I also wasn't sure if it was okay to put up a video of Punch-Out since it is glitchy right now.