Lensa Theme – Source Gallery "Post" doesn't work well

Hi all,

I am using the great Lensa theme.

Now I would like to have a page showing all blog posts in gallery style.

I created a page called “all-posts-gallery” but there seem to be something wrong. Please have a look:

http://hansemotionlabs.de/all-posts-gallery/

Some blog entries do but some don’t contain thumbs.

My goal:
I would like to have all my blog posts in gallery style and one should click on one of the thumbs to jump to that blogpost.

Any idea?

Thank you very much in advance!
Michael
HanseMotionLabs.de