Help with (The data is not proper)

We have recently implemented the insights into our platform. We realise that the data that we get when we check manually and the data that is shown in the insights is completely different. What is the best way to solve it.

It also takes a lot of time for the corn job to run.

@Diljith What are the differences that you are finding between the data you manually gather, and the ones you see in Insights?