Error deleting network interface - no permission

Hi,
we're using terraform to spin up some ec2 instances and then we start a k8s cluster using rke. This works fine. We want to use ELB storage for a mysql database. This volume is created by k8s (via default storageclass pointing to kubernetes.io/aws-ebs as provisoner) when the mysql pod is started.
This works fine, but when the whole system is destroyed via terraform destroy, it will time out because the internet gateway/subnet can't be deleted (aws_subnet.subnet: Error deleting subnet: timeout while waiting for state to become 'destroyed').
The funny thing is, that I can't delete these resources manually as admin! I always get the info that I have not the permission to access that resource. These are the network interface ids I can't delete: eni-04fc3289ea225f06, eni-04fc3289ea225f06, eni-04fc3289ea225f06 and eni-04fc3289ea225f06.
Also interesting is, that these network interfaces are referencing a public ip that doesn't exist anymore. When I select such a network interface and then click on the link of the public ipv4 address, I see an empty list.

Any help is much appreciated