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I'm using the latest version of Chrome on the latest update of Windows 7. This happens on both my laptop and my desktop.
I'll go "Back" and the same page just reloads, and then when I press and hold on the back button, I see that the page has loaded multiple times, sometimes so many that the entire ten or so entries are filled up with the same page.
I unfortunately don't have a specific site that this happens on off the top of my head and it hasn't yet happened today, so perhaps this is more of a theoretical question.
Is it possible for a web site to modify what my back button does? Or could it be something else I am doing? It's really annoying because I have dedicated back/forward buttons on my desktop mouse and three-finger gestures for my laptop's touchpad that go back and forward, and they're really convenient but I've stopped using them because it doesn't consistently work.