When you are configuring PIM in Sparse-Dense mode every router automatically subscribes to the Rendezvous Point Discovery group 224.0.1.40 .
This why when you do #sh run you may have entries for:
!
ip igmp join-group 224.10.50.1
ip igmp join-group 224.10.70.1
!
But when you do - #sh ip igmp groups
You acually get listed:
Group Address
224.10.50.1
224.10.70.1
224.0.1.40
Confusion cleared!
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