Map sprites kept flashing in and out?! What's going on?

Im having a problem with rom hacking recently. You see, i’ve imported a map sprite of Roy into FE8
unfortunately,it started to flash in and out of the screen
If you are able to help me with this,I will be very pleased!
Oh yeah,if i tried to make roy fight,the rom freezes

like this

Ok…Now im starting to lose hope
I’ve switched eirika’s battle sprite with Roys in the way i think proper
unfortunately,it started freezing everytime he attacks,like this

Please send help,im losing hope

OK buddy, calm down. First of all, please keep your questions in one place. Secondly, what tools have you used?

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I’ve used FE editor, nightmare, gba graphics editor