This question was posted using the Android App.
When posting questions using the Android application, tag selection can be a little tricky & error-prone.
The web application provides an autocompletion list of suggestions as you type, but no such list appears in the Android app. It would be very useful if similar functionality could be implemented there.
Also it appears that entering a new tag is friction-free, as might happen when fat fingering a tag. As a demonstration I have tagged this question with a false tag. It should not be this easy to create a new tag, as I would guess the majority of these cases would be mistakes.