Alertness and Healing skills can't be wished for
It gives perception or +HP instead
Currently wishing for "Alertness" gives +Perception instead of the Alertness skill. Wishing for "Healing" heals up your HP instead of giving the Healing skill. Oh I wish I could wish for these wishes! They're the only skills which can't be directly wished for, which doesn't make a lot of sense, and both can be fairly desirable for a wish (especially Alertness).
Alertness should be easy enough to change. For Healing I'd suggest it gives the skill if you're on >90% HP at the time of the wish.