OK, this was probably overkill, but I started over with my RPI - downloaded a fresh image of Rasbian (Jessie), then went through the install procedure for HG.
Same results as I attached before
Then I loaded the page with Microsoft Edge, and (as you suspected) a fresh new setup of HG appeared looking as one would expect.
Don't know why Chrome on windows 10 would not work - tried removing browsing data and cookies, but no success. Would like to be able to use Chrome, but not sure what to do to make it work?