I believe I've told you this once already, but it's because you keep posting WebP files, which only works in Chrome and Opera. Only about 40% of people use Chrome and Opera. Hence all the complaints. This is a public forum, so when you post things that the majority of people can't view, you shouldn't be surprised if they let you know.
Lots is not everyone, not even a majority. Like I said, only 40% of people use a browser that can show your photos. I'm not saying not to post them, rather I'm saying that you should expect complaints when over half of the users can't see them. One "fix" would be to get your pictures from another site. Really? This is what it looks like in IE for me: And just for completeness, in Firefox (My main browser):