New images already voted on! And all ratings the same

Lately (not sure when it started), when I upload an image, they show stars, as if they are already voted on, which is impossible, of course. Also, all images seem to be rated exactly the same now, three stars.

What can be causing this issue? Thanks for any help.

Example gallery: https://www.humortimes.com/1571/surveillance-caricatures/

https://www.ads-software.com/plugins/nextgen-gallery-voting/