Cover photo not showing on the media page

Hello ! Using rtMedia is great, I have a little problem with the cover photo. It normally works fine on all pages, like this http://puu.sh/oLYyL/7017b7f0cb.jpg

But it doesn’t work on the media tab, like this http://puu.sh/oLYBq/65ba3e05b4.jpg

I don’t really know what to do to fix that,and I couldn’t find somebody with a similar issue on the forum

Thanks, Jawad