Although charges may be listed as recurring, you are charged based solely on the purchases you have made on your account. Certain payment processors show LevelUp charges as recurring in order to decrease the chance of your charge getting rejected; this is an industry-standard.
You have nothing to worry about, your LevelUp charges are not actually recurring. This is simply a transaction classification. LevelUp will only ever charge you for the orders that you complete. There are no monthly service charges or subscription fees associated with using LevelUp.