What is "Acceptance" and why is it changing?
This indicates the percentage of ASAP ride requests accepted by you in relation to the total number of ASAP rides that system proposed to you.
You can see your current acceptance rate at main menu in the driver app.
If you see you acceptance rate drop even though you have accepted all proposed jobs, this is probably down to a loss of internet at a time when the system was sending you a job. This is incredibly rare and should not have a dramatic effect on your overall acceptance rate.