I have an hds live unit on my dash, I updated my unit to the current 20.1 software today and went out this afternoon. I also have the 3d module and transducer. While graphing this is what the screen looked like, I had my surface and sound settings on low return, although I tried medium and high and it didn’t change anything.

Is this just silt in the water maybe? Or something wrong with my unit/transducer?

Little bit of Thermacline with a bunch of stirred up carp/debris in the water. My lake has looked like that for weeks on SI.

Thank you, I thought it was a little thermacline but wasn’t sure.

I concur with this.

It's also what pollen will look like when it settles in the water rather than on top. I don't think it's a thermocline because the right side of the DI and 2d are "free" of the clutter.

Agreed. I see this often in river/creek beds after big storms. Combination of cooler water sliding along the bottom carrying some silt/particulates from the main tributary upstream of there is my guess.

I'd bet you're correct. It's not the right time of year to see a strong thermocline. The surface water is warming but we've only had the one hot day so far and as you pointed out, it stops on the right which isn't how a thermocline should appear.