I don't think that's the problem because I'm usually working from a single tab when I get rid of pets and when I do so they tend to be from the first or second page of the group in question.
Additionally when it happens I always seem to end up at a later page in the group. For example, if I get rid of a pet from the 1st page of a 2 page group I frequently get returned to the second page of the group and the discrepency between the page I should return to and the one I actually wind up at can increase as the group gets larger.
If it helps any, I'll be getting rid of the next batch of pets a little over an hour after this is posted.
Breeder of trash deviants