When you close the inventory and open it again, wherever you left your cursor before is where it is now. The highlighted inventory group doesn't default to a set position. Previously, when you opened your inventory it was always in the far right group. With this new unpredictable way that the inventory group selection happens, you have to either purposefully place the selection on where you want it next, or suffer randomness.

It used to be I hit the inventory button, and immediately pressed up or down to scroll around my inventory, and I did that every time. Now I will have to press the bumper once or twice, which will slow me down when I'm trying to quickly get something.