bad smell from Levoit 300

I've had the this for over a year and it's been really great up until the last couple of months- it started omitting a really strange smell... unlike anything I've smelled. It's really unpleasant. Not like a burning plastic or rotting... it's like a mixture between chemical and body odor? Maybe kind of sour? It's super gross and after a night of leaving it on I can really smell it in my room.

I only just realized it was the air filter (and not some weird apartment funk) because I took it with me to a different house.

I can't find too much about it. Has this happened to anyone? Can it be fixed. I just replaced the filter a couple weeks ago and it hasn't changed the smell.