u/Discreetlyred

So, I've been recording with OBS for years, suddenly just started having this issue. The issue: I'll do a short test recording to make sure my co-host and i both sound good and around the same levels. The test recordings always sound great, but then the actual episode recording will only have one voice track, always my guest's. Between recordings, I've literally not changed any settings, or equipment. Has anyone else experienced this? Does anyone know how fix it? This is the third time, I've lost an entire episode, due to it essentially being a one-sided conversation recording.