Early NFL lines often shift a full point or more — like a favorite moving from...

https://post-wiki.win/index.php/Why_Do_%22Sleepers%22_Stop_Being_Sleepers_by_September%3F

Early NFL lines often shift a full point or more — like a favorite moving from -3 to -4.5 — because initial numbers come with shaky info. Jumping in too soon means risking worse odds