Hey there! It sounds like you may have switched a setting in your theme editor that displays the price differently. If that's not the case, make sure in the Global Pricing Rules section of your Oberlo Dashboard you've selected the option to display your compare at prices.
Without seeing your specific store settings it's a little hard to tell. If you'd like to share your store URL here feel free and we can take a look. Otherwise, Shopify Support or firstname.lastname@example.org would be able to investigate further! Hope this helps.