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I always get the "You have selected 1 discussion" panel in the bottom left corner of the forum, even when I haven't selected anything. Even when I'm viewing the site in the smartphone view, where it's impossible to select discussions!
If I select any discussions, it always thinks I have one more selected than I really do. i.e. if I select two discussions it says I have selected 3.
Screenshot (I clicked 'Merge' to get the popup showing that there's nothing really selected):