Calculation Delay

I don't know. I have multiple fields calculating based on the results of other fields and in order to get them to calculate I have to enter a value in other fields to force them to calculate.

My first field, "Strength" requires a user input.
My next field, "Ability_Mod_STR", displays a result based on value in "Strength".
My third field, "Ability_STR_ModLevel", displays the total of result from "Ability_Mod_STR" plus another field.
Then another field, "Fort_Ability" compares the values of "Ability_STR_ModLevel" and "Ability_CON_ModLevel" and displays the higher value or one if equal.

In order for these fields to do their thing, I have to manually enter values in other fields on the form, then they calculate. Here is the code I hacked from scripts I found here and elsewhere.

FIELD: Ability_STR_ModLevel

var Mod = Number(this.getField("Ability_Mod_STR").value);
var Level = Number(this.getField("Init_Level").value);
var Score = Mod+Level;
event.value  = Score;

var STR = Number(this.getField("Ability_STR_ModLevel").value);
var CON = Number(this.getField("Ability_CON_ModLevel").value);
 
if( STR > CON)
{
    event.value = STR;  
}
else if(STR == CON)
{
   event.value = STR;
}

Thanks in advance,
Jim