Hi, sorry this post is super old and if you already have a solution, but if you are using the Fill Bucket tool it probably means there is a hole in the white lineart that is letting the paint flow out of the lineart! To fix this, go over your lineart carefully and fill in any holes and gaps, and then try to fill it again.
I recently got flipaclip and started doing something weird today and it's getting annoying. I have an anime-sh style and the way I fill in the eyes is by making outlines with white but Ehenever I try to color in the face of the character, their whole face turns white, I tried to restart the app but it didn't work. Is there anyway I can fix this?