I caught all the pets on the map, then the next turn, with the magnifying glass, it says there were no pets on the map. I put down some catcher anyway, assuming it would reset the next turn, but it didn't. Still no one on the map. I used the magnifying glass again and there are still no pets on my map. Is this a bug or just bad luck or when is a new set of pets suppose to appear?

The new pet inhabits the den of the caught one in 8 cycles (32 hours). Everything is fine, the new pets will come to your land in a while.