In https://www.ukulele-tabs.com/uke-songs/poshlaya-molli/-uke-tab-56305.html this tabs someone comment. I think this user comment on russian. I think this is bug. I try to send comment from desktop and it view is Ok, no broken charset. But in first comment charset is broken. I sure user post it from mobile device from android application. I try to post from android app and have same bug with codepage. Also android application show no comments, but comments exist.
I hope you can fix this two bugs.