Hunter - Detailed Notes Card - glitch

I played the detailed notes card and it showed the 2 mana discount initially but after selecting the card it defaulted back to its original cost.

This play did end up in me losing since I could not play it to heal. I took a screenshot as well

Was there some effect that increased the cost by 2, cancelling out the discount?

Was there a cost increase for any other card in your hand?

No there was not any cost increase. I can show a screenshot I took if the is a way to upload it.