More @YouTube Studio bugs! When you trim off a portion of video, later on when you add or replace music for that specific video, it glitches up! Also, fix the #AudioLibrary to SORT durations, genres, moods, etc. #AppsBehavingBadly
Sorry to hear about this. We'd recommend sending a feedback report directly from YouTube, here's how: https://yt.be/help/feedback . Make sure to send from the account experiencing the issue.