Tik tok bugging?

Recently got heavily into KPOP Demon Hubters, so i see a lot of edits on tik tok. A lot of the are great, so I heart them to watch later. Idk what's going on with tik tok, buts its un hearing my videos and even erasing them from me being able to watch them. Today, I hearted like 7 videos from an account, checked that they were in my heart section, left. I checked again recently, not a single one is there anymore. Is this common?