Its not a glitch but how the ratings are developed.

I believe the ratings also take into account horses the horse has raced previously. If other horses which the horse raced previously also race today, then their results from today reflect in the horses price.

For example if horse A is in todays race and assessed at $2 and horse B is running in another race today. Horse A ran 3rd last start and horse B was the winner of that race (raced against each other). If horse B ran in a lower or similar class race today and came 15th when they redo the ratings the assessed price of $2 today would be dramatically altered to take into account that a horse which beat it (horse B) ran poorly today.

Its a bit hard to explain but hope you get the drift of it.