Usually, this occurs when Bold Discounts has a discount applied to a product, and the product's variant was manually modified, a CSV import was done on the product, or the product was duplicated.
Doing any of these things will cause the variant ID to change, which will remove important meta-data on the variant which is required for Discounts to function. At this point, you will need to change the product's price manually to its regular price.
To revert your product prices manually, we recommend running an export of your product list and adjusting your prices in the exported sheet. You can then import the edited product list to override your wrong item prices.