Resource Bug?

In my last game I lost a Starbase on a resource to the Altarians. I could NOT reclaim that resource again with a new constructor. But the Altarians could build a Starbase on that same resource. I destroyed that Starbase with a my fully loaded Hero and waited if the Altarians could reclaim that resource. THEY COULD. I destroyed that Starbase again and then could reclaim that resource for my self again. BTW this happened on serveral different resources. Beta 3E on all opponents smart.