Images NOT showing at all in Firefox and IE (&not on Bloglovin, either)?!?

Hello!

My featured images are not showing in the (in raw feed neither in others) RSS feed at all when checking the feed with Firefox or IE? They are showing however, when checking the feed with Chrome, but f.ex. none of my featured images are showing up in Bloglovin (where I have put up my blog) and they say that it’s not caused by a problem in their end.

My feed is: https://www.bizarreglobehopper.com/feed

All the images that should appear in the feed are set as Featured images, they’re not in the body of the posts.
(Also the feed validator (https://validator.w3.org/feed/) says that my feed is valid.)

But could you please solve this problem, why my pics are NOT showing in the feed at all in Firefox and IE??

Thanks!

https://www.ads-software.com/plugins/featured-images-for-rss-feeds/