That is the actual name of the discount (the code) that was used when the discount was created in your admin. In order to change that, you can do so from your discounts page (Admin > Discounts). If you are using a third-party app to create discounts, you would go into that app instead to make the changes.
If there is anything else I can help you with, please let me know.
Hey, @AndreAlba. I can see that the third-party you have installed (Yopto Reviews) is the app that created those discounts. It's worth a shot checking that app to see if the discount label lines up with that.