TikTok glitching?

I noticed the small video glitching, after I upload my TikTok videos. This one is the most recent but the second is there for a bit longer. And it does visually annoy me. I uploaded already done video and just added music in TikTok. Really weird.

1. https://vm.tiktok.com/ZMStohcBk/

2. Really glitching https://vm.tiktok.com/ZMSto2GQF/