On Android, I’m receiving the wrong notifications when there are rescue notifications for Moist Owelette and Gray Malkin.
When there’s a Gray Malkin pet rescue, the notification says it’s Moist Owlette. And vice versa when it’s actually Moist Owlette, as mentioned in the linked bug report.
I believe the issue with other pets happens only during Gnome-a-Palooza when someone kills 2+ Pet gnomes in 1 battle - the actual in-game pet rescue is triggered for the one of them and notification is send for the another.
I’ve never seen a battle (even in GaP) with two Pet Gnomes, but this morning I had an alert for a Gray Malkin pet rescue and thought “Great!”, except, when I went to the Games page, it was Moist Owlette which I already have maxed out.
Given that other people have also had this happen (instead of two entirely different Pets) there seems to be more to this bug, because it would be a very strange co-incidence for everyone to have exactly the same thing.