MOCA adapter installed now pixelated picture

I installed a MOCA adapter to the cable coming into the house and one at the main cable/dvr box, now I’m getting pixelated picture on quite a few channels.

In from wall (main coax from outside) two way (1 in and 2 out) splitter to modem and MOCA adapter, then downstairs from wall to splitter to main box/dvr and other to MOCA adapter, and now getting pixelated picture, and sometimes not getting picture at all. Called xfinity they pushed updates, reset box multiple times, had me unplug it multiple times, etc... still getting pixelated picture, so I disconnected splitter and put the connected wall coax back to box, now everything is back to normal. Is there something I am missing? I was told by multiple people that MOCA would not interfere with the “tv” signal. Do I need a signal amplifier somewhere? Am I missing a step?! Frustrating that nobody at Xfinitys “techs” can help me.