Wavelab create silence at the end

Hi guys im realy nooby with wavelab.
I usally work with Cubase, but now with wavelab 9.5 Elements for mastering.
So far everything works but something create silence at the end which i didnt want. Not Just a few sec but half a minute, I dont know what to do searching for a long time now so i thought some of u might know what to do.
Thanks for ignoring bad englisch and answering.