If you have no "Spellbook" Spell Cards in your Graveyard: Reveal 3 "Spellbook" Spell Cards with different names from your Deck, your opponent randomly adds 1 of them to your hand, and shuffle the rest back into your Deck. You can only activate 1 "Spellbook Library of the Crescent" per turn. You cannot activate any Spell Cards the turn you activate this card, except "Spellbook" Spell Cards.

So if you use any Spell card except Spellbook Spell Cards first then you can not use Spellbook Library of the Cresent.

Also that second bug, it looks like you used Pot of Duality that turn: Reveal the top 3 cards of your Deck, add 1 of them to your hand, then shuffle the rest back into your Deck. You can only activate 1 "Pot of Duality" per turn. You cannot Special Summon during the turn you activate this card.

Please read and pay attention to cards you play.

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