Add to Display not working in Model Builder

[JamesPoeschel]

Whenever using inline variation substitution, my outputs do not add to display despite having them checked. 
My settings in the geoprocessing has outputs default to display as well. Yet after running my model, the outputs just go into the gdb and never get added to the map. 

My full output path is %Workspace%\%State Abbreviation%_County_Boundary

[Robert_LeClair]

Question for you - are you running the model in ModelBuilder or as a tool from a custom toolbox?

[JamesPoeschel]

I am running as a tool from a custom toolbox.