Currently when I'm at my computer and I remove a tag associated with a task, that tag continues to show up in the smartlist on the android app. I was told by support that this was expected behaviour-but why? When I delete task's tag, why wouldn't I want it deleted everywhere?

It's annoying because I use RTM to implement GTD and I often want to delete a tag, e.g., atcomputer and move the task from my nextaction list to my waiting list. Thus I don't want it to show up in the atcomputer smartlist anymore. I delete it on the computer and it disappears as it should-but it remains in the smartlist on the Android app.