This might happen due to the fact that Apple combines your recently made purchases and sends you one receipt for them.
You can still find the receipt for each separate charge if you follow these steps:
- Go to reportaproblem.apple.com.
- Sign in with your Apple ID and password.
- A list of your recent purchases appears. If you’re not sure what you were charged for but you know the amount of the charge, search for the amount. If you're looking for information about older purchases, find your purchase history in Settings or Account Settings on your device.