Featured image dissapears almost random

Hi There
First of all Thanks for this awesome plugin!
I just have a small bug I’m trying to get rid of since a few hours…
When I filter the “kamera” items, on of them dissapears and the one below is half cutted white.
I read about lazy load causing some problems, but to my knowledge, I have no plugins runing that could cause this. Also I downloaded my whole site and ran a search though all documents in my wordpress directory containing “lazy load”, the only plugins that uses it seems to be yours…
I use Firefox on the latest version on MacOSx and am really looking forward to ideas on how to solve this!
Thanks!

The page I need help with: [log in to see the link]