Card effects not working in Training Grounds

I played Training Grounds today and my cards were mostly not functional. Demolish did nothing, Volcanic Rambler did not destroy gems on entering, Shadow Spear added no Lifelink (even when fetched and cast by my opponent), Fiery Demise did no damage, Theater of Horrors did not put Activate Gems on the board and so on. For my opponent, everything worked fine. Was that a cheater or a bug?

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