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The EC2-Other includes multiple things releated in EC2 instances (but instances itself) like EBS volumes and snapshots, elastic IP addresses, NAT gateways, data transfer etc. Have a look at this blog, chapter "Tip #2: Understanding the EC2-Other service category", to find out what is contributing to your "EC2 Other" bill.
Ps. If I had to guess what this $45 could be, I'd bet on NAT Gateway (+ potentially an elastic IP).
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+1 for picking up on the NAT Gateway, the hourly price ranges from 4.5c in some US zones, through 6c in APAC, up to more than 9c in Sao Paolo. 0.06x24x31 would arrive at the $45 figure.
https://docs.aws.amazon.com/vpc/latest/userguide/vpc-nat-gateway.html#nat-gateway-pricing
Also select last month's bill in the billing dashboard https://console.aws.amazon.com/billing/home#/bills and it will show everything that was billed.
Expand the EC2 section and drill down to see which region(s) are using resources, and what type of resource it is (NAT gateway, EIP, EBS, snapshots, etc.).