Why can't I change the upper-case "A" on the About page to lower-case "a"?

[mroberts1]

I prefer to use lower case for all headers. I have been able to change all of the other headers to lower case and manually edited the index.html page in /about/ to lower case. But when I re-generate the Jekyll page on localhost, the upper-case "A" magically returns. Surely something so simple shouldn't be this difficult.