[Ansys 11] Different stress value in plot and list results

[darq]

Hello
I have analyzed a model, and have problem in interpreting the results.
When i plot the results:
Plot Results -> Contour Plot -> Nodal Solu -> von Mises Stress
I can read maximum stress value SMX = 229.38 MPa

But when i view all nodes:
List Results -> Nodal Solu -> von Mises Stress
It is written: Maximum Values -> SEQV = 225.01 MPa

I don't understand why max stress value is different in plot and list results.