[Therion] Bug !?

Hi I'm using Therion 5.3.15 on Windows 7 (64bit). While inserting different things in a .th2 file using the map editor I get very often thinks like: "point 2428.8199999999997 1966.990000000000..." But not all point are in this format. Some of them are in a "normal" 2 decimals form. May be there is a little bug rounding these numbers!? Not really an issue as it works but just as an information... Torsten