"Boss" Monster Glitching Flicker

[CheekyLions]

I'm doing this game for a jam, and I'm about 90% finished, but I'm having an issue with the final "boss" scene. It glitches like crazy when I enter the screen. I've set the Player Position inside the screen on the attached rom (all original content), but the attached image is what it's 'supposed' to look like. The player palette looks weird when placed here, too. I wondered if that had anything to do with it?

Thank you. You all have been incredible.

https://www.dropbox.com/s/vrgsdqvwl6mir88/game.nes?dl=0

 

[Dirk]

Is your boss eight sprites tall?
I think NESmaker has a problem with large enemies. Try to make him 7 sprites tall.

 

[CheekyLions]

That did it! Thank you so much.

 

[Dirk]

No problem, I'm glad it worked

 

[CheekyLions]

Me too You all are so helpful! I must admit, learning to use this program has been pretty frustrating sometimes, but I feel satisfied when something finally works!