

They put their repo first on the list. Packages will default to Fedora’s repo if available. You may specify which version you want, if you both know that it’s happening and know that the package you want in particular is available at both.
I really again do not know how this could possibly be the fault of another repository. Fedora is making decisions for ther distro that circumvent FlatHub, this is not FlatHub’s fault.
I believe the reason Fedora does this is to satisfy their regulatory goals, I don’t know the full story behind why they have their own seemingly broken build of OBS on their repo but I would imagine it has something to do with a codec’s worldwide licensing rights or similar. I believe the approach that should be taken is that Fedora should stop offering this package in a broken state as compared to continuing to do so, but that’s an outsider opinion.