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This question has been answered by Geraldus. See the first response.
Sounds like the plugin wasn't removed?
Can you check under Elements > Plugins if TinyMCE is still there? If it is, go ahead and remove (or deactivate) it and that should sort out your issue. If it indeed wasn't removed, that's a very good bug report for https://github.com/splittingred/TinyMCE/issues