Video/Audio slips out of sync after speeding up nested sequence

Hi all, the title says it all.

Basically, I am editing 6 min long video that has a bunch of clips, text, images, and uses greenscreen. I'm planning on posting on TikTok, so I wanted to shorten it a bit since I find that shorter vids do better so I created a subsequence and then sped that up to 150% to make things easier (basically, there were a few individual clips that were going to go at a different speed than the others, so i sped those up in the original sequence first, and i also wanted to preserve the timeline of the audio/text/greenscreen effects).

This worked at first but ended up slowly slipping out of sync so that by the end the audio is about 0.5% than the video, so the mouth doesn't match up talking.

Does anyone know how to fix this? I could just export the original sequence and re-import it to speed it up, but I like the nested feature that allows me to still edit the original sequence.