Why do Bet Labs system matches change?

Certain betting systems may show matches for games that end up "falling out" of the system by the time the game starts. There may also be games that enter the system that were not previously showing. 

This is because many systems use parameters that involve fluctuating numbers (betting percentages, spread ranges, weather data) that change throughout the day. 

One example of a system that would not have changing matches would be: Road teams off a win vs. division opponents. None of those three filters can change, therefore the system matches would stay the same no matter what. 

One example of a system that could have changing matches would be: Underdogs getting 30% of spread bets or less. A team could go from an underdog to a favorite depending on the line movement, and could go from 25% of spread bets at noon to 33% of spread bets by game time. Systems like this are prone to matches changing, which is why you should try and wait until close to game time to ensure your picks don't fall out of the system.