Images being linked

[blind-eddie]

I don't believe they are being linked. Whom ever uploaded those images need to
change a setting on their PC.

Via ftp, go to that image path folder. you will see it is in fact named, image.png.png.
Remove the extra".png". If you are using a image hosting mod from here or
the built in member galleries, you will need to go to that image folder and remove
the extra extension. You may also need to edit each post.

On my PC, I don't show the extension's of any file or image. Easier for me when renaming.
Some times, I will copy the name of a file, with the extension & rename my file with
that name. Upload it & see it with two extinctions.

This could be your issue.