In the homepage of Data SE, I see that some sites have an extra "SE" in the name, while the rest don't have. Is this an intention or just a kind of bug?
At first I thought that this is a duplicate of “ - Stack Exchange” suffix no longer displayed in page title on many secondary sites, but as you can see not every beta sites have the suffix.
It's just an issue with tidying up the metadata, yeah (so a bug). When I have time I'm going to determine what the easiest way is to keep the site names consistent and in sync so it's no longer a problem in the future.
The expected behaviour is for "Stack Exchange" to be removed from all of them, with the obvious exception of this site, Meta Stack Exchange.