There have been some receiver problems where the LNBF voltage didn't change between Vertical (13v) and Horizontal (18v).I get a good signal on NASA, it appears to be opposite polarity of Telemundo S2 channel (s). Check your feedhorn/polarity switching.
edit to add : I checked all 3 channels coming in fine-they're discussing a piece of space debris that is coming near the ISS.
What kind of dish/receiver/lnb you are using?