Multiple Groups for alerts

[mtkaschools]

For any service, if we have more than one contact group selected for alerts, only the first group listed actually get the alerts. This happens for both hosts and services.

[lmiltchev]

I was not able to recreate this issue. On one of test machines I added two contact groups to a host and the members of both contact groups received alerts.
Can you check if both contact groups are actually added to the particular host/service? Do members of each contact group are configured properly (e-mail address, notifications enabled, proper time periods, notification handlers, etc.)?