It seems that the process used to generate the title attributes for the image links on the Stack Exchange store encodes an already-encoded string, leading to situations like this:
where the title attribute looks like the following:
title="Stack Exchange Pens —  Got some serious writing to do?  Get..."
We all know that Serious Writing™ necessitates spaces that don't break under pressure, but it'd be nice if they were a bit less intrusive. In this particular situation just removing the extra spaces it's trying to preserve from the main product description would work, but I imagine it might be a more general issue.
are extra strong spaces. They can withstand pressure that a mere ` ` would crumble under. In the industry, we call them "load bearing spaces".