Hello,
In the AV policy, make sure the there is a check in the check box and lock icon is closed for each one of these.
1) Download Insight
2) Proactive Threat Protection (SONAR)
3) Auto-Protect
The Standard Symantec SBS AV Policy does not have the Lock boxes locked.
Once these features are Locked and Policies are assigned to the groups, you should not face these issues.
Check these Screenshot below:
Hope that helps!!