Please fix thiss

Idk if this only happens to me, but when im reading there are black lines that shows like the pages i guess? Its so annoying while im reading. It can get in the middle of some of the characters face or smth so they just look hella weird. Is it happening to anyone else? Bc it wasn't like this when i first started reading on desirescans. And sorry if i explained bad, English is my second language