I dont think it was ever confirmed that Nikita (the first of the two polar bear females to give birth, earlier this year) attacking her cubs was the cause of death, but who knows
The connection i've realized is that Inukshuk (our male polar bear, and the father of these cubs) has had litters with atleast 2 (maybe even all the females if Nikita did indeed attack and kill her cubs) female polar bears that have attacked and killed their litter (The first instance was at St Felicien, where the mother of the cubs "Aisaqvak" attacked, killed and ATE her cubs)
Aisaqvak and Inukshuk bred again, and she very successfully raised her second litter, and I'm sure our male does not carry an "eat your baby" syndrome or anything of the sort, just a strange coincidence. I'm even sure that if Aurora was again given the chance to breed, she may be a better mother that time around