I know what you did. I have done this too. You probably modded the XML, and placed a file containing All the Techs, planetimprove, whatever, in the mods folder. The game now reads Both the XML in mods\data\whatever folder and the galciv2\data\english. Now, if you're Adding something completely new, all you need is a short XML file with your additions. However, if you want to Tweak or change something already there you need to put thew WHOLE file in your mods directory, and back up the original and place it in a seperate folder (I made one called "Backups" in the English folder) or simply rename the original (Soemthing simple like StarBaseModulesX or RaceConfigBU ot whatver so itsis till easily identify). That way your mod will show up but you won't get the double techs, buildings, starbase moduels, whatever.