Calculation of utilization

Hi guys.

I am wondering how I should read the utilization output? 

By looking at the axial stresses it is clear that they exceed the strength of the wood:

Even some of the middle values, 1.86 kN/m2 (18,6MPa) is higher than the bending strength of the elements 1.3 kN/m2 (13 MPa).

So when looking at the utilization output, this gives me:

So does a negative procentage mean exceeded strengths or is it the positive or how am I to read it? I would think it would be ranging from 0 - 100% (maybe +100%).

Or have I set the color scale wrong? I mean this output is pretty weird, and gives me the impression that everything is fine, when In reality a lot of the bending moments in the elements are higher than their strenghts.

Thanks Rasmus