That's always going to happen when you squish any skin as narrow as it will go. I don't really like this skin very much, but still, it ought to work for those that do.
What you can do in the meantime is:
Extract the attached XML file into the Thunderstorm skin folder, over writing the existing file. (This will only last until you next install or update MC)
OR...
Make a copy of the Thunderstorm skin folder, in the "Standard View Skins" folder, You can name it anything you like, but Thunderstorm (Mod) will match what you see in the subsequent skin choices, then extract the attached XML file into that folder, over writing the existing file.
Back in MC, pick "Thunderstorm (Mod)" as your skin.
Better?
If yes, that will keep you going until an official fix is released, after which, you can safely delete the "Thunderstorm (Mod)" folder.
-marko