Candice not letting you select your Water Energy when you don't have Pokemon to select from

When I played Candice it was not letting me select Water Energy when I didn't have Pokemon to select from and my opponent was playing Entei and Slugma. Slugma was on the field after I knocked out their Entei and my opponent Gajabsmsb had no benched Pokemon left. I played Candice after Slugma switched in and Candice showed I had one Water Energy but no Water Pokemon I could select from and I was prevented from selecting the single Water Energy as I couldn't drag and drop the Water Energy to take it. They were also using main cards like Charizard Ex in their deck since after the battle it showed that's what their main card was. I hate to say this, but I think some players might be using cheating tools to prevent other players from being able to select cards so the turn will skip to their turn or they might hope a player concedes out of frustration.