This could be if you have encryption on for either your EC2 instance or the snapshot itself.
Typically, resources may not be encrypted on creation, but there are some settings that can enable encryption by default. For example - EC2 snapshots and volumes can be encrypted by default by the following account settings (per region). In the EC2 Dashboard, under Account Attributes, select Settings.
I would suggest encrypting resources as a general best practice - whether it's AWS-managed keys, AWS-owned keys, or even Customer Managed Keys. For more information: https://docs.aws.amazon.com/kms/latest/developerguide/concepts.html#key-mgmt
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