This is an important concept for understanding. Point-lines are not the same and are not the same as online casinos around the globe.
Think of a minute at the casino sports betting bookie viewpoint. The only goal is to get as many bets as you make the same amount of action on both sides of the bet. They make their percentages and do not risk losing money.
However, most times more money is placed on one side of the bet than on the other side of the bet. This will endanger the house. If the team wins the highest prize money, the accountant can take one ton of money.
What do sport books need to do if all the money comes from one side of the bet? Here are the lines. What sports books are doing, adjust the line to make the other team more attractive. So more people will bet on the other side of the bet, and the sportsbook will be more balanced. That's why there is line movement
When all the money hits one side of the bet, the line moves to make the other side of the bet more attractive. This also indicates how smart money is. There are some ultra-superstars who everyone else tends to copy. When placing one of these superstars stakes, they will often imitate their stakes all over the world and this will cause the line to shift.
So this is often the hidden reason for the line changes