Blog post list layout rendered differently in Vivaldi

Just noticed that in Vivaldi the layout for the blog posts is a bit broken:

More specifically the digest-container which stays in 1 column instead of wrapping in 2 as it does in other browsers for the same window size (ex here with Firefox):

The only difference I noted while inspecting both browsers is that -webkit-text-size-adjust is not supported by Vivaldi but I don't think this has anything to do with it.