I tried it with a different page. Same thing.
However, when I put in the character content limit of 50 it worked fine on home and on the test page.
The read-more works fine on home page footer but not a content page.
No, I don’t have any plugins active except Gen Responsive Slider.
When I get a chance I’ll try it with a different theme… but like you say I don’t see how a child theme could be at fault unless you have some special code in functions.php or home.php that messes with the footer? I looked and didn’t see anything.
All in all, not a big deal… it just surprises me. I left a post on the StudioPress site about it and maybe someone will explain it.
Have you been able to replicate it with Optimal?