I think there's something wrong with this site's search reindexing job.
For instance, a search for [google-chrome] closed:0 (sorted by relevance) lists this question having been asked in April, 2014 and with only the google-chrome tag. However, if you visit the question, it was modified in March, 2017, and doesn't even have the google-chrome tag on it.
This is probably the root cause of the bug reported in this question. Could, maybe, someone on the development team take a look?