Hey tkorkalainen -
It looks like you floor is in the persistent level which is always loaded and has all shadows applied to it. Try moving the floor into each level and have it load in each time, this way each version of the floor will only get the lighting that the level it is in has built into it.
Think about it like lights should be highest order or in a persistent level while the objects they are lighting should be in a lower order or a streaming level.
Thank You
Eric Ketchum