Tiktok ruins audio after posting

Oh my god I’m going to lose it. I make music and post it on TikTok. I posted a video today. It looked and sounded great in the previews so I posted it, and for the next couple hours it sounded just fine.

I checked the video a couple hours later and the audio’s COMPLETELY fucked. On all the high notes there are static sounds and it sounds like the audio was increased a LOT.

I don’t understand…I posted this video before in drafts and the audio has stayed okay, so why now that I’m uploading it public the audio gets screwed?