Multiple TVs in public places playing different shows at the same time.

Does anyone else notice this? I’ve been working in a bar for the past year and a half and I’ve noticed something. On maybe 20-30% of the channels we have (on a 100 channel box) TVs play different shows on the same channel. We’ve tested this by having TVs side by side and setting them to the same channel. Sometimes they play the same thing, but sometimes one will play a cartoon and one will play the news. My best guess is that this is like a separate dimension thing, like a glitch.