Did the app autoupdate recently to 0.0.67? If it did, some massive changes/improvements were made in said update, which also affect way votes are displayed.
https://github.com/LemmyNet/jerboa/releases/tag/0.0.67
When your instance admin updates to the latest Lemmy software version, you will be able to hide votes again and have more control over what you may wish to hide or show: upvotes, downvotes, score etc
Out of curiousity, I visited one of the sites just now and was able to download a random book from one of the links provided. That said, the first set of links for the book didn’t work.