Let me know if this changes the text! If not, please share which theme you are using, and if you are using any apps that modify how your products are displayed. Any further screenshots of the product page on the storefront, and the product details page in the admin are also helpful.
If you are using a product customization app, it may be overwriting the variant settings available in the admin. If this is the case, I recommend reaching out to the app developer directly to receive further assistance. You can find their contact information by locating their app in the Shopify App Store, and looking under Support.