Bookshelf android app seriously bugged

Hey guys, I have serious problem with my Bookshelf app for CFAI official curriculum. Mathematical equations in the app broke down couple weeks ago and even reinstalling the app doesn’t help. Upon opening an ebook, I noticed a loading sign in the bottom left corner, which continues to load for a bit and ends up briefly showing an error sign “File (file location)/mathZoom.js failed to load”. I have no idea where this came from. This way, all quantitative equations show silly things and are basically unusable. Good thing I managed to finish reading the curriculum weeks ago…:confused: Anyone have a similar problem?