In unreal blueprint, every time I release the left key of my mouse, no matter click or drag, it creates a comment.
And I cannot even group the comments to delete them.
Any idea on how to resolve this?
In all seriousness, it sounds to me like a stuck key, default C. Perhaps more than one.
Also, in the Editor Preferences - General - Keyboard Shortcuts, check what hotkey is the Comment shortcut assigned to.