IGMP - PIM Dense Mode - Joining to Multicast Group 184.108.40.206
The 220.127.116.11 group is the Cisco-RP-Discovery group. This is a reserved multicast group in the Auto-RP system that is used to propagate information about existing rendezvous points and group-to-RP mappings. This group always works in the dense mode and that is probably the reason why you see your router being subscribed to it even though you have configured PIM-DM as your multicast routing protocol that does not need RPs.
Regarding the possibility of deactivate Auto-RP, Laurent Aubert answers this question in this thread:
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