As you can clearly see [organic-chemistry] is a tag that I have been watching. However the first question in the image doesn't show up as watched. This behavior is not seen on Meta SE but seen on all other sites which is confusing. Does anyone else have the same problem?
According to this post on MetaSE, the issue has been discovered and a solution is enroute. From Marc Gravell, an SE staff member,
Sorry about that. What happened here: the favorites/ignored feature is implemented client-side; a UI tweak changed the DOM in a way that broke the jQuery selector, meaning that it no longer found the tag data. I've put a PR together that fixes this - we'll get it deployed as soon as we can (after validation, etc).