Understanding y+ colouring in Solution Fields

Using SimScale
1

I have in a simulation a view of y+ (in Solution Fields). e.g. in this project: SimScale Login
The colouring I don’t understand. It looks y+ is always zero (using Inspect Point), but the colouring is changing. See these two grabs:

Inspect Point at z=0.47:

afbeelding
afbeelding493×510 10.2 KB

Inspect Point at z=0.68:

afbeelding
afbeelding485×503 10.8 KB

So how do I interpret the y+ graph colouring? Thanks for your help.

is there some extrapolation happening form the first layer midpoint y+ value to the wall?

<changing the ledgend min and max values also has non-understanable behavoir in the colouring, IMHO>

All the best,