Can't edit home page content in Sept Dir 2016 child theme

Hi,

I’ve just installed Sept Dir 2016 child theme. When I try to update the text or banner image in Page Setup > Hompage: Edit page content, it won’t update.

After saving in both locations and then going back to the Edit page dialog box, the text has reverted back to what it was and the new banner image URL is still there, but the old image is showing on the site.

Any ideas?

Thanks.
Lisa