I see some manual editing in the HTML files. Can you please test if you generate the album now, and test the local preview do you see the same problem?
The editing I see is completely pointless and using the FONT element is deprecated in modern HTML.
I confirm that the problem exists in the local preview as well (see also the screenshot im my post before).
The server where fodoh.info is hosted is from a professional web hoster called all-inkl.com.
I made a small copy like you and uploaded it to a raspberry pi hosted in my home with apache web server. Here the link and as you can see the problem exists there also: https://doh.spdns.de/Test-fodoh.info/
I also tested with Java 1.8.211 instead of 1.8.241 - the result is the same.
Regarding the FONT element this is realy strange. When I search the index.html of the folder Makro-Fotografie on the web server only one time the word font or FONT is found, see attachment. I can't see these "font style" elements.
I added to that small tes album a folder "other pictures" and put in there five pictures from a camera of a smartphone. There is no ISO and no aperture (Blende), but the pictures have those values. Because I've deactivated the right click protection you can check the pictures yourself.
May be this is because my home folder contains only folders but no pictures. If this is true, could this be changed? Otherwise I could solve this be putting some pictures there.
Regarding the unusable sliders which are not displayed. At least this confused me. May be you could display just this one value instead of a slider. This would be consistent e.g. to the maker and the camera model where the value is shown even if there is only one.
Thank you again for your great support and the excellent skins.