Refuse bags splitting too easily along the seam

I have bough two bags of Garbie Super Saver Refuse bags (20 per pack). The rolls of bags are now connected by their sides to each other where previously the bags were connected top to bottom to each other. This results in the seam splitting very easily. When I say easily, I mean if you do not unravel the bag gently, it already splits. I have used 5 bags and they have all given the same problem. When the bags were connected top to bottom to form the roll, I never experienced this problem.