Recently, I noticed that the number of Unanswered questions with my tags on a site had suddenly changed from about 2,500 to around 750.
I have traced it back to my "favorite" tag having been removed from my 14 Favorite Tags and instead appearing amongst my Ignored Tags.
I thought it extremely unlikely that I would have done this deliberately or accidentally, so I added it back to my Favorite Tags and removed it from my Ignored Tags.
A short time later I found that the tag had "jumped" from being a Favorite to being Ignored again.
I tried adding two other tags to my Favorites (one shorter and one longer than the problematic one) and they appeared to stick so it does not seem to be the number or length of tags causing this.
Has anyone else seen any of the Favorite Tags they have set show up later under Ignored Tags instead?
The page on which I am seeing this is https://gis.stackexchange.com/questions but I would not expect the issue to be site-specific.