In the header of the Grav's blog, declared Atom and RSS links are wrong:
--- html
<link rel="alternate" type="application/atom+xml" href="http://getgrav.org/feed:atom" title="Atom Feed" />
<link rel="alternate" type="application/rss+xml" href="http://getgrav.org/feed:rss" title="RSS Feed" />
TXT
so automatic detection of feeds (for example by the RSS icon in the Firefox toolbar) don't work.