For some reason, the image in your album is in the CMYK color space instead of sRGB. I don't know why - when I enter the same URL for the web page, jAlbum picks up a "clean" JPG, in the correct color space. Did you enter a URL for the representing image manually?
The first is the slide image (1200x1117), while the second is the normal thumbnail (86x80px). You might want to bump up the thumbnail size - 225x80 is way too small for Photoblogger. The default is 300x300. The redness is probably caused by a wrong Java version. Please remove the red file from the slides folder and regenerate the album with the latest jAlbum.
You are a magician. Whatever I tried I could not reproduce this error with the same URL.
I tried everything I could think of, both in Win10 and macOS, and couldn't reproduce it, either. The resulting JPG is in the CMYK color space - that's why it's a mess. In Firefox and Chrome, it's mostly red - Safari just gives up completely, and displays solid black. I have no idea how it's even possible to make jAlbum produce a CMYK image. There's certainly no project setting that would do that.
I can imagine if you link to originals and enter the representing image manually you can achieve this. Or perhaps jAlbum picks the wrong representing image from WikiPedia sometimes? Anyway it's strange no one else but Andre can achieve this. There must be some "secret".
The "Settings / Photoblogger / Advanced / Folder thumbnail size" variable is set to 86x80. Set this back to its default value: 600x420.
I have already that setting, see attached screen shot, so it is caused by something else.
I did add also an image discussed in this thread. It shows here the caption correct below the thumbnail. The ListMetaData shoiws the same result as with other skins.
If I click on that image, the image is enlarged, but I see no navigation buttons to go back or go to the next slide. I like to see here also the caption. What should I do to see a caption and see navigation buttons?
If I make a test album with only the problem image, the caption is also displyaed wrongly, see here. Can you explain the difference?