Twitter sharing button seems OK, but when I try to post on Facebook, it does not show a link to the post/page I went to share, but instead only to the login page for the site, no matter what page/post I’m on:
Thanks. I just tried it. I have ten other plugins besides Jetpack and I deactivated them all one by one, refreshed the site, and then tried the FB sharing button each time, and unfortunately, it didn’t fix the problem.
I was able to reproduce the issue on one of your posts, and it seems that Facebook had cached a wrong version of your post. When entering the post URL into the Debugger, Facebook’s cache is cleared and the correct data should be assigned to your post.