Facebook refresh when exiting issue

I seem to have run into an issue that I'm not sure how to fix.

A few updates ago to facebook, the back button on my phone started to refresh my facebook feed rather than exiting the application. This happens if I scroll down a few stories, then press the back button I'm put back to the top and it auto refreshes.

This issue is really annoying. Has anyone getting this same issue or have they figured out how to stop it?

Thanks
Michael

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