Could the AI be set to double check/loop through playable skills in play. So far it's the creature in the 1st slot only that I've noticed this for. AI played a mitosis on a devonion dragon, then an SoR, but did not use the skill. Later in the game, in the 2nd creature slot, on the same turn, same set up, the AI did use mitosis.
This happens for a couple scenarios, where the AI can use a skill or card from hand, but doesn't because it couldn't the first time through, but a double check is needed.
-edit-
and then of course i play against my arena deck again to test it and it plays the mitosis/sor then actually uses the skill.
-and another game, AI only used the skill once : /