There's the Noise Suppressor filter in OBS, that I assume you don't have? And there's also one in Windows itself, that I suspect you still do have.
Windows has two primary markets, neither of which is media production: corporate business, and casual home. Both of them want their calls to "just work" in terrible environments, mostly because they don't understand what an awesome job their brains do in cleaning it up for them. So Microsoft has that "feature" on by default, and they've hidden the control to turn it off so that the more nosy of both groups don't accidentally disable it and then blame Microsoft for "breaking their computer".
In general, any time you set up a rig, and especially if it relies on a mass-market general-purpose thing, you need to *slowly* explore ALL of its settings, figure out what each of them does, and set them all on purpose to suit *your* purpose.
The ideal for media production is "a straight dumb wire" in absolutely everything except where you intentionally have all of your processing, and even that is bare-bones minimal to get the job done. Don't leave stuff hanging around because you forgot you had it or didn't know in the first place: that's an excellent way to have problems later!
Take a good full day to explore, find all of the settings across Windows itself, whatever drivers or enhancement apps you may have, etc., and get that "straight dumb wire". It probably won't be by default, because consumers like candy.
