Audio quality gets way worse after upload

Hi, I've recently moved my content to tiktok but I'm having a problem.
Audio really really sucks, and I don't know why. The same exact video on YT, FB and IG works no problem.
On Tiktok while I upload I can hear it good, then when it goes live the audio quality drops down a cliff.

I've tried multiple settings, -3 dB, -1dB, upload to 1080p instead of 4k, nothing works.
Why? I just want my video to play as good as the other platforms