there is a relation between JEM image settings and these images.
Perhaps you have to work with ftp in the views/default.php s and his css.
did you try simplelist menu and jem banner module and jem teaser module too? There are different possibilities.
Thanks for your answer.
I figuerd out that the relation between Image size in Jem Wide Modul is 50% of the max. Thumbnail size in the general settings of Jem.
