Thanks for the response. I’m not sure how I could solve it by checking their GitHub, but I noticed one thing. The img string is different on the frontpage and single page. Do you maybe know why it acts like this? On the frontpage it seems to add he src as well as the srcset, which makes it work on frontpage and not single pages.
Frontpage:
<img alt="lunga" width="866" height="650" class="alignnone size-large wp-image-359" srcset="https://gunmad.net/wp-content/uploads/2004/06/lunga-866x650.jpg, https://gunmad.net/wp-content/uploads/2004/06/[email protected] 2x" src="https://gunmad.net/wp-content/uploads/2004/06/[email protected]”>
Single page:
<img alt="lunga" width="866" height="650" class="alignnone size-large wp-image-359" srcset="https://gunmad.net/wp-content/uploads/2004/06/lunga-866x650.jpg, https://gunmad.net/wp-content/uploads/2004/06/[email protected] 2x">