Firewall log filling with IGMP traffic from Rule that is no longer active

[MMTadmin]

My firewall log is filling with IGMP traffic from 1 ip address from a rule that is no longer active or even in my firewall rules (I deleted it). It was the Default Allow to Any rule, which I have since deleted. You can see here what I get.

Jul 15 09:36:49	LAN	(100000101)	  172.16.48.169	  224.0.0.1	IGMP

The rule identifier (100000101) is no longer even a rule. Even if I try to make a rule to block all IGMP traffic the log file still fills with this info. What am I doing wrong?