Copied & Pasted a List & Workflow- Now It Doesn't Work

I am working on make my chat mobile-friendly, so the main sidebar with users disappears and a new floating footer appears with just pictures of users on mobile. I copied and pasted all the original groups, including the workflows. It looks fine at first, the 3 most recent conversations appear.

But when I search in that bar- no one appears. When debugging, I get this error:
“the list of users of this element has been modified by an action, the data source property above is therefore not applied”. The original still works fine.

Any idea why this may be?