By everything, do you also mean re-pairing it and/or setting it up from scratch?
The first step with this kind of weird app issue is to try restarting/killing the app. With the Radio app open, press and hold the side button until the Power Off, Medical ID, etc options appear, then press and hold the Crown to kill the Radio app. Relaunch the Radio app and see if it's fixed.
If that doesn't fix it, the next step would be restarting, but you've tried that.
If a restart doesn't fix it, the next step would be to try un-pairing and re-pairing the Watch, restoring the last backup.
And if that doesn't fix it, the next step would be to try un-pairing it and setting it up from scratch without restoring a backup.
But if you've tried all of those, it's probably time to contact Apple Support to see if they can help.