Mystery gong noises when I open TikTok?

Now I should start by mentioning that it only happens about once or 2 times a day. Sometimes every other day, but for about a week now off and on when I open TikTok, I’m hearing a noise that sounds like someone beat on metal like a gong or a humming bowl. What is happening? It’s driving me crazy I know it’s not coming from videos. And it is not from the advertisement when you first opened up TikTok. It is so strange and it’s driving me crazy cause it seems that it’s not happening to anyone else.