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The website in question is http://www.kerbalspace.agency/Tracker/body.asp?db=bodies&body=Kerbol-System
with latest Firefox, if you hover your mouse over the light blue planet dot you'll get a tooltip that looks like this: http://i.imgur.com/ZRFqSbz.png
This happens to any of the dots if I scroll to move them to the middle of the screen
Looks okay though in Chrome when displayed to the left using my hack to get the tooltips working with image maps.
using Tipped 4.5.6