IPTV traffic with IGMP partially working?

[dvtestguy]

I have a 6505 (Querier) -- VTP -- 4948 (Snoop aware at L2) and have 50 IGMP groups joining a membership to VLAN int 620. I have traffic generating (see below at bottom) to all 50 channels, but only see 10 of them see the traffic (10.115.62.6-10.115.62.15)(239.255.33.1-239.255.33.10).

Traffic Gen:
Source Destination
MAC 00-10-10-11-01-01 MAC 01-00-5E-01-01-01
MAC Increment 0-0-0-0-0-0 MAC Increment 0-0-0-0-0-1
IP Address 10.115.62.6 IP Address 239.255.5.1
IP Increment 0.0.0.1 IP Increment 0.0.0.1
Port # 2000 Port # 3000
Port Increment 1 Port Increment 1
Number of streams 50

Cisco configs:
interface Vlan620
ip address 10.115.62.2 255.255.255.240
ip pim sparse-dense-mode

sh ip igmp int vlan 620
Vlan620 is up, line protocol is up
Internet address is 10.115.62.2/28
IGMP is enabled on interface
Current IGMP host version is 2
Current IGMP router version is 2
IGMP query interval is 60 seconds
IGMP querier timeout is 120 seconds
IGMP max query response time is 10 seconds
Last member query response interval is 1000 ms
Inbound IGMP access group is not set
IGMP activity: 100 joins, 50 leaves
Multicast routing is enabled on interface
Multicast TTL threshold is 0
Multicast designated router (DR) is 10.115.62.2 (this system)
IGMP querying router is 10.115.62.2 (this system)
No multicast groups joined
IGMP snooping is globally enabled
IGMP snooping is enabled on this interface
IGMP snooping fast-leave is disabled on this interface
IGMP snooping querier is disabled on this interface
IGMP snooping last member query interval on this interface is 1000 ms

sh ip igmp group
(sees all 50 channels...i cut/pasted first and last)
IGMP Connected Group Membership
Group Address Interface Uptime Expires Last Reporter
239.255.33.1 Vlan620 00:02:38 00:02:35 10.115.62.5
239.255.33.50 Vlan620 00:02:36 00:02:38 10.115.62.5

Any ideas why I would only see traffic on 10 out of 50?

Thanks