Gradual Aging Simulations not passing variables correctly

Hello,

I'm having an issue with gradual aging (reliability analysis) for 2, 4, 7, and 10 years where if I define a variable through a .scs model file the variable gets passed on correctly to fresh/stress/2 year simulations but at 4, 7 and 10 years the variable returns nil. Attached are my settings:

If I create an empty design variable the same thing happens. Only when I define a global variable with a value does it get passed onto the 4, 7 and 10 year simulations. However my variable changes depending on my PVT and therefore I need to define it through my model file:

simulator lang=spectre

...

parameters VOL=0.45 VOH=1.35

...

My output expression is delayMeasure(VT("/vout") VT("/vout") ?edge1 "rising" ?edge2 "rising" ?nth1 3 ?nth2 3 ?value1 VAR("VOL") ?value2 VAR("VOH"))  which works fine for fresh, stress, and 2 year but returns 0 for 4, 7, and 10 year as VAR("VOL") and VAR("VOH") returns nil

Thanks