Thats weird because these images are <img src='' /> you can check it out yourself.
See this page: http://www.blikoptest.nl/index.php/item/2-test-bericht-2
Why is the image gallery not replaced with the correct urls?
I mean if you have this plugin, isn't it supposed to get all the images, else it isn't really working as intended.
EDIT: Ok, I have moved the Amazon plugin to the last place, now it's changing more urls, looks better. Unfortunately, the gallery is not replaced:
https://imgur.com/M1DdLzn