If after full doublecheck of the settings and making sure they are at sane values try these steps:
Different computer.
Did the noise subside or radically change bamd placement? Then we can look at the computer a little more as one of the sources. To mitigate any issues make sure your SDR is shielded, that your cables are good and put ferrite beads on all your USB cables.
If you want to go the extra mile a small circuit that grounds RF on the USB power leads will make sure that isn’t the ingress.
I say “one of the sources” because your power supply will produce spikes unless it is a linear power supply or battery which is the next step: make sure you have a RF clean power supply, not using the computers USB to power it but a clean linear analogue power supply.
If you aren’t doing that then you will see a lot of weirdness in various spots across the ranges at very low signal levels.
Switching supplies are always spike monsters and create other noise as well.
You won’t be able to tell what is what when it comes to noise until you do at least those first three steps of shielded enclosure, blocking RF on the USB cables and clean power.
Your environment makes a mess too, do you have fluorescent lighting? Who doesn’t. Switch them off and see if that helps some of the noise.
Same for every appliance in the house including the fridge.
Which leads us inexorably to if it is not from the computer.
Then it is environmental and you will have to either play bug hunt with a field strength meter or a small SDR dongle works great for that as well. Hunting down environmental noise is a full subject unto itself, one that every ham should have passing familiarity with so if you aren’t a ham but know one contact him/her and they can probably help assuming they aren’t an appliance operator type.
But first look to your shielding, power supply and isolating your USB cabling.