3/19/17 The guide is all wrong tonight, why? Channel 3 at 9pm is supposed to be Madam Sec. but it is NCIS?? Channel 4 says CHicago fire But it is some British Intelligence Crime drama? What is going on??
CBS and other networks aired NCAA basketball tournaments or other sports live. Many ran over, causing the guide to look wrong. I know CBS was about 35 minutes late. Depending on the programming, some will simply shift the schedule. Others may start partway into a program, especially if it's a repeat or low-rated. Fox seems to have learned after the murder of "Futurama" and now the 7pm ET slot is usually a repeat that is expendable.
I don't know if X1 can really update itself that fast, and non-X1 definitely cannot.