Creating ubuntu from vm image SSH CERTIFICATE THUMBPRINT is filled

I have the problem that the SSH certificate is filled without setting an option to use an certificate.

I've done the following steps: 

1. Create vm from gallery Ubuntu Server 14.04 LTS choose username and password and NO WITHOUT ANY SSH certificate

2. Vm (vm1) is created WITHOUT the SSH CERTIFICATE THUMBPRINT 

3. Shutdown the created vm (vm1)

4. Capture an image of the created vm1

5. Create vm from gallery and choose captured image of vm1 choose username and password and WITHOUT ANY SSH certificate

6. When the virtual machine 2 (vm2) is Running it has a SSH CERTIFICATE THUMBPRINT 

This looks like i bug, i provide no where an SSH CERTIFICATE THUMBPRINT and it sets one. When using the default image it doesn't set the SSH CERTIFICATE THUMBPRINT.

How can i fix this so the SSH CERTIFICATE THUMBPRINT is NOT set?