Are there people cheating? bugs?

Sometimes, Whenever I use a card to search for a card in the deck, i.e., I play an Ultra Ball card to get a Scizor to evolve my scyther but Some how I cannot click/drag on Scizor. I can click on any other cards but the specific one that I want I cannot click on it or drag it down to the slot to obtain the card. Happens every fcking time when there's a chance to turn the game around in my favor.