When I go to the reputation tab of someone's network profile (e.g. mine), I find that clicking on the name of a site to the right of the reputation graph (e.g. "Meta Stack Exchange", "Japanese Language", etc.) does not cause the line corresponding to the site to disappear from the graph.
This isn't a new bug - it's been this way the entire time I've been using Stack Exchange (at least since, say, August 2013; I've been using Chrome the whole time). I only found out that this was a bug in the first place after reading Oded's comment that explained that apparently something is supposed to happen when you click on the site names.
I'm using Chrome 34.0.1847.116 on Windows 7.