Has anyone else seen this account liking your comments?

I have 3 accounts on TikTok (1 that is my old personal account that I don’t use anymore, 1 that i post on, and 1 that i use for watching only funny stuff) and I realized, after logging back into my old account, that this account likes random comments I have made on all 3 accounts. It is always comments that no one else has liked. They do not follow any of my accounts and I don’t follow theirs anywhere. This has been happening for a while. Any thoughts on why that is happening? It seems to be some kind of promotional account, so maybe they are affiliated with TikTok?? It is super weird