Cancelling a TV show seems to show the wrong cancellation date. My show was supposed to be cancelled on 9 April according to the tooltip, but the season is not yet over so it's still going one day later.
It seems the tooltip for general info (total new fans, next episode date and such) also showed 9 April for the next episode. It finally got canceled one week later on 16 April, so the tooltips just seem to be one week off from the correct date.