Split Channels on import - Feedback

Hi,

So I recently had this bug occur a few times, when I bring in a stereo SFX or file and in the “Import options” box I select “Split channels” and put a reverb on one of those tracks it creates a feedback loop. But if I move it to a new mono track it works perfectly fine.

Does anyone know how to fix this/why this happens?

Thanks!

I attached a video for reference!