Variant Product Prices Do NOT Change When They Are Selected

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I purchased the theme "Vantage" and added apps.  I have about 4 different variants (Type, Color, Length, and Thickness).  The prices for each of these variants are supposed to change.   

This problem started when I added a few apps:  Best Currency Converter, Tidio, Reviews.  I un-installed the apps completely.  But the problem with the variant prices still exists.  

I've reached out to WeAreUnderground that developed the "Vantage" theme.  They have looked at my store and told me that there is nothing out of place in the store coding.  

So what am I missing?   What error in the coding should I be looking for?

My store is: has a password on it.