As the image shows, when you are subscribed to multiple communities that have the same name (e.g. Fediverse and Gaming), the app will only show one leaving the other inaccessible unless manually searched.
This is how the subscriptions should look:
Very impressed with the app, a lot of good work being done!
I think this is a different bug, the community name domain matches the domain of the user that posted it. From your screenshot I'm guessing nitrofuel is from lemmy.world
See my screenshot below, this is from the Beehaw gaming community, notice how the domains match with the user?