Why am I sometimes unable to select valid targets?

squibix

A few times in the last few days I've been unable to select valid targets when they're presented by the game. Using Town Store Forest Seal Stone was the first tool shown, but I wasn't able to select it (I could take other tools). In another game I played Misfortune Sisters and Switch Cart and Ultra Ball appeared as valid targets, but only Ultra Ball was selectable to discard. Why is that?

Dougbro1

I've been experiencing this too. I used a Battle VIP Pass but couldn't select the Hisuian Lilligant V that I needed, while all other Basic Pokémon were fine.