Not able to Peer with AWS VPC

I want to peer AWS VPC with atlas and I have a AWS vpc with CIDR 10.0.0.0/16.

When I try to peer it using Atlas peering it was showing an error like “VPC CIDR” overlaps with your Atlas CIDR.

But Atlas VPC is 192.168.248.0/21.

I have checked this with external tools but there is no overlap between the two.

Kindly help me to solve this issue.