I don’t think that was a glitch with OotS. I was in a match about a week ago and after being wounded I was unable to regen or heal from a healing station. I was sitting there for close to a minute before teleporting back to base where it began working again. But for that minute I was at +0 hp while wearing regen gear next to a station. Which is really annoying in the middle of a key push and you have about 100 health left!
Literally only happened once (at least that I noticed) and chalked it up to a rare bug.
Well the question here is can you get it to happen again. Once can just be glitch or happenstance.
Play another game, or maybe a PvE mission, and make sure you do not have anything that reduces healing received. If it happens with any consistency, then we got something to look at.