Mic echo only with one scene collections

[Indigomyst00]

I added a new collection by hand building out each scene and source. I am getting mic echo as if desktop audio is picking up my mic output. This collection is set up the same way as all of my others that were added prior to the v29 update. I can switch to another collection and do not have the issue. I have tried disabling all the audio sources in settings, made sure that desktop audio and my mic have monitor off. I have tried muting both of them, all to no avail. I really don't want to scrap the whole collection and start over. Any help would be greatly apprciated.

 

[AaronD]

Do you have screenshots of all that? You say that it's all correct, but it's easy to miss something.