NDI running on a laptop with two monitors. Zoom running on the same laptop (multiple participants), I pin one participant to one screen, another participant to another screen.

vMix 4K running on my desktop, both NDI feeds come over just fine, and go into a PIP output. Multicorder records all three videos, output plus the two inputs.

Now, the problem. The output and one of the inputs is recorded fine, but the other input is recorded as dozens of short clips.

Any idea what might cause this?

Thank you,
Ervin