The title in one of the sidebar boxes isn't right. I hadn't noticed this before, so it may be new, although I don't think we've had any tweaks recently. Or perhaps it's just me and my browser (Chrome 67.0.3396.99 (64-bit) on Windows), or it may be a moderator thing if the Edit link is restricted.
The words "Favorite tags" should be centred, with the decorative thingies right on the edge of the box, like the one below it. I'm not sure where "edit" should appear. Perhaps something like
"Edit | Add a favorite tag"
That box has now been superseded by a different one:
But the CSS spacing appears to have been applied to the bottom of the "Watched tags" box rather than the top. So it's still a bug, just a different one. And I really dislike the crude image of binoculars which doesn't match anything else in the theme.
At least "Watched tags" means that the spelling of "Favourite" is no longer an issue!