What the hell is going on with fire damage??

Has anyone else run into this? In the past — maybe two — weeks I keep getting a bug (I think) where I catch fire and then it just doesn't go out until I'm dead. Like, I could have full health and I get to watch it all just burn away — and I mostly play heavy, so it's a lot...

I've also noticed weirdness with trees/foliage that's on fire — like you could be a good 5 meters away from a burning tree and then suddenly you've taken insane amounts of fire damage. This is especially noticeable on maps like Kyoto or P.E.A.C.E Center. And the two issues seem to happen in tandem quite often; you'll run vaguely close to a burning shrub on full health, catch fire, and just die...