I agree, Bueller?!!! I've tried everything under the sun (at least from my perspective) and no matter what you do (i.e. clear history, clear cache, etc.) if you keep hitting the back button, it takes you back to previously viewed websites. Help?!!!
I don't know if this will work, but I at least have a theory you can try. While in the browser, click on settings, then click on windows. You should see a list of any open browser windows you have. Click the X next to any open windows you have. Then the browser will reopen to your specified homepage (and hopefully without any previous pages able to be reached with the back button).
Let me know if my theory works.