Why does it do that?

Perhaps I shouldn't complain too loudly, making use of free software. But why does the formatting change after a blockquote on this blogger template? There's nothing obviously amiss in the code for the individual post, so presumably it's buried deep somewhere in the template, where I haven't the patience to look and wouldn't recognise it if I saw it. It's not just my blog it happens to; I've seen it with other people's on this template. It's a new thing, since Google acquired it, and didn't happen with the old version. I've checked.