The question here seems to be tagged with close, which, last I checked, is a synonym of vote-to-close. How is it possible that a question can be tagged with a synonym? Don't synonyms automatically get replaced on questions?
Creating a synonym does not ever cause an automatic merging of the questions. All it does is remap future occurrences of the tag to the master tag.
When I created that synonym relationship, I didn't bother merging them for whatever reason. That means any questions that were already tagged with close kept that tag. If the post gets further edited, or a tag merge takes place, the tag will be automatically remapled at that point. Until then, it keeps the original tag.
Tag merges are not automated because it helps fix mistakes. If we just create a synonym that shouldn't have been created, we can easily delete the synonym and all the questions which previously had the tag will have it once again. Once a merge is done, that process is incredibly tedious, as it has to be done manually.