Hi,
I was able to check y our form and noticed that you weren't using a sum(field1) when adding the total sum of a repeating data. Further tests shows that the checkbox isn't refreshing the total sum value. The workaround is going to be a bit tedious so I would suggest using a calculate button that would add all the values. Your button formula should look similar to this:
sum(SoftwareCheckBoxes) + sum(AccessoriesCheckBoxes) + HardwareProfileOption
Is this approach possible for you?