Moze kill skills not registering kills and stacking properly (Phalanx Doctrine and DiB)

Hey folks,

With the release of the 4th dlc, I decided to dust off BL3 and level a Moze. Recently, I’ve begun to notice that Drowning in Brass and Phalanx Doctrine are not stacking at all in a variety in cases when I kill enemies. At first I thought it had to do with popping out of Iron Bear (which I know clears all stacks) and it causing some kind of a delay in starting to get new stacks again, but it seems to happen even if I am just running around as Moze killing stuff. This kind of breaks the entire skill tree for me, and am wondering if anyone has run into this as well. Thanks!

Here is a link to a short video I put up on YouTube to highlight the issue:

YouTube Video Link