that's because the bb are letting you pass their guard
Haha, that may be true. But, HONESTLY (I know, I'm "that guy") some of them were legit passes, because they came off failed triangle/armbar baits. I've never passed our BB's with the basic guard passes unless it was obvious they were slow-rolling me to let me work.
Now, that said, for every 1 triangle/armbar bait that I was able to pass a BB guard with..........there were 50 times I got choked or nearly had my arm broke.