
Hey J.C.
What is the size of the original image uploaded? Could you please post a link to the page if it isn't on a local install?
Thanks,

https://www.medischekeuringen.net/pmo-preventief-medisch-onderzoek/
The source image itself is 2560 x 1440: https://www.medischekeuringen.net/wp-content/uploads/pmo.jpg

Hey J.C.,
I checked the original image and the size is 427x240
. Your code work fine but the original size for that specific picture is smaller than the resize so it doesn't work.
Cheers,

Well that is insanely weird. When I call up the raw image url, I get the 2560 size. Think I'm going to have a word with my browser cache - again.

Hehe, yep it can be your browser cache or even server cache 😉