Lightbox popup Position

Hello,

I am getting a strange problem.
I am using the Lightbox tool, it is working on one side and the other side on a wrong position:
kfzgutachter-vaatz.de/
if you click any box under "LEISTUNGEN" the Pop up shows only in the div over it but if you click on a bit in the bottom under "ÜBER MICH
" for example it is showning the right way over the whole page! what am i doing wrong it is the same code.! it should under LEISTUNGEN also show over the whole page

thaks