link to View Non-AMP Version doesnt work

hi,
since last update the link on the bottom of the page to the non-amp version doesn’t work. when i press
the page for example: http://www.improve-yourself.info/amp/
the link on the bottom : http://www.improve-yourself.info/amp/?http://www.improve-yourself.info
instead of http://www.improve-yourself.info/
this happens on several sites.