Andy Miller wrote:
Would love to fix it, but It's an installer bug in Joomla 2.5.0 and 2.5.1. The Joomla bug squad is aware of it and hopefully the fix will be rolled into 2.5.2.
The only way to resolve it is to delete the extra rows in the #__extensions table. On the plus side, it doesn't seem to effect anything functioning.
Crikey... strange bug to miss. Well, strange bug at all, actually.
Thanks for the info Andy.