Problems with second account, browser tiktok and saved videos

I used tiktok for like one year without any type of problems, then I started to save videos in the section “favourited videos” in order to find them quickly and avoid always searching among the thousands of liked videos I have. But I don’t know why, sometimes some of the videos I saved in the favourited videos disappear, replaced with the gray screen “video not found”, even if I can still find the video if I search it with another account. Sometimes all videos of a profile disappear and I also became unable to even search and see the profile of that person with my account (as if I were blocked, even if this happened so many times with account of people I don’t even know and I didn’t do anything wrong that could make them block me, so I think it’s a bug or idk). And also another problem is the fact that when I use TikTok on my computer I can’t like videos and follow new profiles. And last but not least, when I switch to a second or third account, sometimes I can’t follow a certain profile (I keep pressing the follow button lots of times and every time I refresh the page of my profile, the profile I just followed isn’t there and it’s like I never followed them). I don’t know if this is a discouragement against people that want to use this app on computer or people with multiple accounts, either way this is really unfair, despicable and obnoxius. Idk if those problems are spread among other users as well…