Interference with IPTV?

I use 2 indentical switches :TPE-1020WS (Version v1.0R), discontinued
I try to put IGMP snooping on but it seems it’s not helping (it’s off now) and I know the decorder uses VLAN 30
I have poor network knowledge, so suggestions are welcome

attachment 2 pages from documentation about IGMP snooping, full doc is on the website I mentioned