I can't see when I enable audio waveform

I’ve had a sudden problem with audio not being visually visible on the video line. I can’t see the waves. I thought it was a common problem and found the post on the forum, and found the item ‘Show audio waveforms’ that exists on the Settings > timeline. It was enabled and I tried to turn it off and on with numerous iterations to no avail. I’m writing because it’s hard to find answers in other posts as well. FYI, I’ve finished editing well by today and it happened while creating a new project to edit a new video. I struggle with editing without audio waveforms. Does anyone know anything about it?

Additionally, testing shows that other projects do not find this phenomenon, and audio waves are clearly visible. The problem only occurs in one project. I don’t have a touch or touch setting, so I have no idea what to fix.