Bugged

For a couple days now when I open comments and close them the video shrinks on my screen and a black bar appears at the bottom. They become unplayable and the only way to fix it is to close the app completely. Ive tried restarting my phone, clearing the cache and cookies, redownloading the app, and adding 2 factor authentication but it says I can’t add a password or email due to security reasons. Idk if my account was hacked or something but it’s pissing me off bad. Does anyone else have this issue???