Stereo Audio Only Playing in One Channel

I’ve got a vertical video I went to add into a sequence. Originally, I duplicated my original sequence (a different iteration of the video, no major differences), deleted the old clips, and then added in the new video. When I pulled it into the sequence, the audio only played back out of my left channel. I tried a fill right with left - no go. I tried panning the audio - no go. Note, I have data in the left and right channels on my clip. It’s just only playing one.

I created a brand new sequence, and pulled in a clip, and told it to match to clip settings. Same problem - only the left channel was playing back. At this point, I’ve checked all my sequence settings to make sure they’re correct, double checked the audio settings on the clip to be stereo and mapped properly, and checked my headphones. The clip plays fine in the preview window. I also tried to remap my data channels to play both out of the right channel, and even that didn’t change anything. Still out of the left channel only.

I had to right click the clip in the project window and create a new sequence from clip just to get my audio to playback normally. I also had this same issue happen on an existing project that was flipped from the older version of Premiere to the 2026 Premiere file. Assuming it’s a bug with the new version, but this is really frustrating to have to work around - especially when it randomly pops up. I’d appreciate some insight into this or at least a promise to fix the problem soon.

Screenshots attached.