I'm working with the Debut theme and the product variant's price does not show up when the variant is selected in the dropdown list, although the different pricing is clearly registered in the back office.
The variant's price only shows up when added to the shopping cart, but this is not enough. It should show up during selection.
Any help would be more than welcome.
As I check in debut theme demo it's working fine. May be you did customization in the files and break something just because of that it's not working for you.
1) If you don't did any major customization in the theme, replace it with the latest copy.
2) If you did major customization in files then you have to manually find out the issue and fix it.