PDF Document has grey space - please Help!

Edit: solved the problem. There was something called 'markup' added and as i deleted this, everything works fine

As you can see in the photo, my created document has a nasty gray space on the right side. I wrote this document with ms office (newst version) and then saved it as a pdf document. It has no comments included, already checked that. has anybody got an idea what i can do to avoid the gray edge? thank you! (im using the german version of both programms)