To expand on my earlier observation, here are all the powers visible at character creation with either the wrong level listed in the power description, or no level listed at all (except for tier 1 & 2 since that's likely on purpose).
I took a quick look at the regular client, too, for comparison, and this issue is present on many of the same powers there, as well.
Anyway, there's a lot of these, so the affected powers are in spoiler tags so that this post isn't a mile long.
I sadly don't have time to check all the epic/patron/pool powers, so if anyone else feels like taking up the torch on this very minor issue, be my guest.
Powers that do not list their level requirement (not including tier 1 & 2):
BLASTER (11 powers)
BRUTE (5 powers)
CONTROLLER (1 power)
CORRUPTOR (3 powers)
DEFENDER (12 powers)
DOMINATOR
MASTERMIND (1 power)
SCRAPPER (5 powers)
SENTINEL (1 power)
STALKER (20 powers)
TANKER (5 powers)
Powers with the wrong level requirement listed:
CORRUPTOR (2 powers)
DOMINATOR (6 powers)
SENTINEL (1 power)