Mobile stream app casting

I have the xfinty stream mobile app on my android device. I have 3 TVs that all run Google TV with Chromecast built in. The app is supposed to be able to cast to Chromecast devices but only 2 of the TVs will show up as being able to cast to and the other one doesnt show up in the drop down list. I can cast other apps to that TV but not the stream app so Chromecast is working on that TV. Why won't it cast to that TV?