TV cable question

[AnArky]

2016 model 3950BR, full timer. Have searched this forum. Looked up diagrams, etc.

Never hooked up 5er to cable nor to satellite as we typically stream. But we will use the antenna sometimes in a new location and scan for channels. Antenna works well particularly with the swineguard wingman added. Bedroom and Living room TVs are new. Both work well with antennas same as original TVs, if not a little better.

Here’s the issue. We happen to be in a park for several weeks with cable TV included. Turned the signal booster off at bedroom cable connection. Then connected the park cable to the CABLE input in the convenience center.

Bedroom TV cable scan results in all 72 park provided channels as expected. Living room TV scan results in 0 channels.

This is perplexing as both TVs work with antenna. I don’t have a coax patch cable as I’ve seen on a few forums and would not be sure where to connect or if it’s even needed.

What do you think? Poor quality splitter? Again they both work with antenna and in theory I think it’s supposed to be the same wall connection as antenna.