Background Waterfall Noise "Lines" Normal?

[arasakaintel]

Hello All,

I recently purchased a BladeRF xA4 Micro. I've noticed after using the BladeRF in SDR++ (My main SDR listening software) I always seem to see these "lines" in the background of the waterfall.

I've used different antennas, and even moved outside to test to see if they would disappear but it's not the case.

When listening to signals with SDR++ FM etc there isn't any audio issues, I'm just curious to why there's always these background "lines" in the waterfall.

Just wanted to make sure this is normal, or if anyone else has experienced these.

Cheers!

I've uploaded a photo to imgur for review ---> https://imgur.com/a/lSFewi9