Tablo is displaying 16.9 channel in 4.3 some channels

hello, I’m new to tablo but not to OTA channels since I was a Tivo user, I have few channels in my tablo that are displaying 4.3 and I see peoples elongated, same channel in the Tivo display 16.9 I know some channels broadcast in 4.3 and 16.9 simultaneously and TV switch to correct format, that is not this case specific Chanel is 31.1 Telemundo, there is couple channels in the lower frequency that show 4.3 but if I go up in my guide to channels that have not numbers I see same channels in 16.9, I have a 55" Samsung if I go to Samsung OTA channels I see this Chanels 16.9 but I can’t record it, like History and couples more I like to watch, I appreciate any idea how to fix this issue.

The first step would to be where your tv stations are transmitting from. There could be over 10 stations in the country what broadcast on that frequency.

Thank you for your answer, like I say before if I use my Samsung TV OTA channel 31.1display in 16.9 an perfect picture, but if I use Tablo app, it display 4.3 picture distorted and people elongated using same OTA antena (with built in splitter ) there is two different tuning
one in the TV the other in the Tablo, not make sense to me.

If the actual OTA broadcast is 4:3 versus pillarboxing the signal into the TV tuner is handled by the screen format option. This option usually doesn’t work for HDMI connections. You would have to try to apply it or change it for your HDMI port. Tivo may be preprocessing the signal before it streams it to the HDMI port. Or maybe your STB has an option to upscale to something other then 480i or pass thru.