All APs are receiving multicast traffic, instead of only the APs that need it.

 If all APs are receiving multicast traffic instead of only those that need it, it indicates that Multicast Internet Group Management Protocol (IGMP) snooping is not enabled. IGMP snooping is a feature that allows a network switch to listen to IGMP network traffic and ensure that multicast packets are only sent to the ports associated with interested receivers, thus preventing unnecessary traffic on the network. References := CCNP Enterprise Wireless Design ENWLSD 300-425 and Implementation ENWLSI 300-430 Official Cert Guide