Mobs Spawn in bright place

Please post more details. Activating the F3 debug screen on the screenshot is a start. After that, is this single player creative or survival or multiplayer? If multiplayer, is it a vanilla server or a Bukkit server? What is the exact light level on the blocks where the mobs are spawning? What is the difficulty level set to and what time of day is it in the world? As many details as you can provide will be helpful. It will be next to impossible for us to try and reproduce this as is.

Cannot confirm.