Yes. I think this has more to do with the power not hitting enemies that happen to be standing on a slightly different vertical coordinate. For example when the enemy is standing on a little pebble on the floor, or the player is, the power does not seem to hit the enemy or only deals a fraction of the damage.
FYI fellow wizards, I almost made this confusion: this is about the Encounter Power Lightning Bolt, not the At-Will Power Pillar of Lightning.
its not even really lightning bolt, atleast not compared to tabletop d&d, they should put that version in the game and get rid of this encounter with broken aiming
Answers
FYI fellow wizards, I almost made this confusion: this is about the Encounter Power Lightning Bolt, not the At-Will Power Pillar of Lightning.