Burden of Time

[Sleepy]

Hi.
Has anyone ever had GE's NOT disappear when you kill the mage? Right now I'm playing a SP game, and three GE's put in place by C'tis are still active, ten turns after I eliminated them from the game. Two of these are Burden of Time and Foul Air, so you can guess how annoyed I am.
Oh, and the GE I put up disappeared promptly when the mage was killed. Of course.
I guess this is just a bug... just wondering if anyone else has experienced it.
I'm playing the seven-nation rumble scenario if that makes any difference.

cheers...