This continues for the next 60 days from the date of order cancellation. It will gradually flow downwards, you can prevent it in 2 ways.
One is on how many orders you received within those 60 days. The other is on how many orders you have completed. As you complete one order, your complete rate will move upwards, which is very effective. But after 60 days, it starts a new chapter and becomes 100% again. So, need to be complete more order to restrict the flow down on your 60 days period.