Insights data very confusing. Differences between Insights Instructor Dashboard

We really need to understand Insights and data that we see there vs data in Instructor Dashboard, for instance. It is really messy, and numbers don’t add up in any way. Instructor Dashboard says we have 9848 enrolled students, Insights says we have 5397. The course started jan 2020 (still running), but insights only shows data from nov 2020?
Are there generally problems with insights? Where/who can help with this.