finally I found the solution myself. If anybody has the same problem, this is what you have to do:
1. Find your function.php within your theme.
2. within the function “blank_setup()” or “setup()” add two lines of code:
remove_shortcode( 'gallery', 'xtreme_gallery_shortcode' );
add_shortcode( 'gallery', 'gallery_shortcode' );
this will remove all xtreme framework functions from the gallery and adds the standard wordpress gallery. jetpack will change it later again to it’s own gallery settings.