thanks for your reply Baboon, but how do you explain this?
the pumpkin is a model, the table as well even 'Sora' is a model
(yeah I've got the Sora model but without animations, and as far as I remember it's not illegal to have it, since I'm not using it in commercial projects right?)
and they all are affected by the level lighting. the left tree isn't and the right tree either

and the gras isnt too.
maybe it depends on the tree leafs, because they are like bitmaps?
I removed the alpha channel from the texture of the left tree and set it's overlay flag.
hope you can explain this to me please~ and how i solve the problem. dynamic lights didn't work as well =/
greetz