Help plz! Color change when limbs overlap..?!

Hey Everybody,

I have a problem with my animations. When for example the arms of my characters overlap them selve, the color of the overlapped area, changes in to a lighter shade. I dont want the color the change, it looks wierd.
When different drawings overlap everything is normal. But when one drawing overlaps itsselve, because of bending the skeleton, it changes color. It’s one drawing bend with a skeleton, that overlapped area changes in color.

Can anybody tell me what to do? i would be very gratefull cuz im kinda stuck with this.

Thanx alot