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Enabling the dev tools then device mode (CTRL+SHIFT+I then CTRL+SHIFT+M) will sporadically cause the browser to go forward/backward when doing a regular click. As far as I can tell the only way to get round this is to either disable rocker gestures, restart the browser or not use Opera for dev work. I tried reporting this ages ago but no fix. 
@leocg thanks for the reply. I don't often use other Chromium browsers for dev work but I can't find any similar bug reports for other browsers, which you'd expect if it was on Chrome as it is pretty prevelant when it happens.
I can't say for sure but the problem seems to be tied with Opera's rocker mouse shortcuts.