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Don't remember that happening to me. Odd.
Maybe a mod you are running is causing that behavior in the reduced worldspace of Zion?
I'm playing on PS3. Mods are no excuse.
The PS3 versions of bethesda games are usually more broken than usual.
Well I don't think it's a bug that on one spot a gecko spawns, then when I come back just few hours later, dozen of Cazadors spawn.
It could be a bug with the timer for respawn of the cell. Maybe it just ran out of memory to keep track of it and it's just happening almost immediately.