Simulation output results showing different names for the Expression used to calculate

Hi,

I have some expressions (fig1) that calculates some results. I am running a parametric simulation for a parameter Ron. 

In the plots after the simulation, The name labels for each expression looks different (see fig2). 

Settlinerror(Vin) is shown as error, Q1 is shown as Qerror, Qerror is shown as Q

Why this is the case? Any one have experienced the same situation?

Thanks in advance