I know im the only person to try and use these cards lol.
This one is the minor one but i think its an easy improvement. U.A. Hyper Stadium after activating provides a pop up that says “Select an option” [yes] [no]. It should likely say “Would you like to add a monster to your hand?”.
U.A. Locker Room after activating, has you target an F.A. or U.A. card in grave or field and return it to hand. afterwords you get a pop up that says “Target a monster to return to hand”. This is incorrect, as you are now resolving the second part of the effect, where you choose monsters to shuffle back into the deck, and get a draw for each.
Both of these cards ARE working correctly, its just the interface is wrong.