Beyer changes figures far more often than most would imagine.
I get the DRF Winners Books and track them for more than a couple of track. They don't usually change a lot, but sometimes you will see a 5,6,7 point change. Sometime whole days or weeks will change by a pint of two after he monitors his track to track performance. Good Quality Control.
Not a big deal because when you buy the PPs, you are getting the latest version. Being a 97 now means nothing if it is a 105 on Belmont Day. That is the fig people will be looking at in real time.