Recording Issue

I’m a long-time Audacity user, but this has me stumped.

Building a project by recording in stereo on several tracks, I suddenly find that “Record” mode creates a new mono track and starts recording there at the time marker where the longest previously-recorded track ends. I can’t find any reason for this, and I was recording on the other tracks for several hours without any issues before the problem occurred.

Check in the Device Toolbar that it is set to record “2 channels stereo”.

Thank you.

It was switched to mono recording, which is odd because I haven’t even opened that menu. I’ll know what to look for if it happens again.