Let me tell you guys something about this app. If you don't want your shopify store to get bugged with discount codes then DONT USE IT. Even after deleting the app its still popping up with discount codes and everytime I try to get it removed it pops up with another 50 discount codes. On top of that their customer support sucks the lady I talked to called "Karina" wasn't much help at all. I guess I can still run my shopify store with this glitch. But it isn't the most ideal thing.
We've tried to contact you a few times but didn't hear back from you.
You've used the "Generate Unique Coupons" option, therefore each visitor to your store got a unique coupon and that's why you saw a lot of new coupons (all the coupons have the same prefix, therefore you can easily delete them if you want).
If you want to display an existing coupon for all of your users, you should select the "Existing Coupon" option, and in that case, the app won't generate any coupon codes for your visitors.
Feel free to talk with us at firstname.lastname@example.org - we'd love to help you change your app settings. I promise you that you'll be happy with the app like the other Coupon X users :)