Talon Recent Collections

That's a shame you didn't receive either of my replies. I even tried to switch to a gmail address for the second reply in case your spam filter was over-active because the first email was apparently not received.

I think the issue you ran into can happen sometimes when another app remakes the collection with the same name but different Shopify ID. In this case, the existing collection is stilling being maintained by the app but a duplicate collection created. In this case, you'd need to find the collection still being maintained by the app and use it for your shop's collection page. Evidence of it should be that there are two collections likely with the same name in your collections list.

Update: The app that the collection in the app maintains would be able to be found within the app by clicking "View in Shopify". It might be different than the one you expect. Another thing I can do is clear the product cache on the app's backend. That, in some cases can solve an issue like this. Anyway, I believe your problem is very solvable if you'd like to re-install the app and I'll take a look.