I wanted to address this situation myself, as I was the scheduler for the shops in question. There was a problem with the session that all of the shops were in. When the fee changed a couple of times throughout the project, all shops were updated to the new fee - not just new shops assigned after the rate was changed.
In order to solve this, I have worked with Automotive Insights. I have provided them the dates that the rate of pay was changed and they have pulled a report to show when shoppers accepted the shops. They are paying all shops based on this criteria, not based on what the rate shows on the log.
I apologize for the confusion. I am here to answer any questions if you want to contact me directly.
Joni@summitscheduling.com