A normal website will handle a Back button request be it in the browser of coded into a button on the page.
It won't work if it is a Supersite.
Perhaps if you check the Web Export Option and change from Supersite to Conventional Website, this might allow the Presentation issue to go away.
Open Options > General and Web Properties > Website.
If you change, document type to Presentation (Web) does a tick appear against Presentation website?
Does it happen whichever your pick or tick?
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