SCCM Device Collection (Exclude Security Group)

Hi

Can some one point me in the right direction please?

I have setup a device collection with the following rule: -
System Resource - Security Group Name - is not equal to - *Security Group Name*

But I keep getting computers that are in the security group show up :(
Now if I swap it to: -
System Resource - Security Group Name - is equal to - *Security Group Name*

I only get the members in this security group, so I dont know why "not equals to" is not working?

*sorry look like Spiceworks dose not have a Microsoft SCCM group :(