I notice the additional price has recently started repeating in the dropdown on the configurable products on a clients Magento 2.3.7 site.
I tried the suggestion to set the actual price (as that would be preferable), but it made no difference:
https://community.magento.com/t5/Magento-2-x-Programming/Show-actual-price-for-each-option-in-dropdown-for-configurable/td-p/406916
Please help debug and fix this.