Sophos issues and update confirm

Hello Sophos team

I'm a member of Công Ty TNNHH Fujikin VietNam team. I would like help explaining the weekly report section.
1.About my company Sophos weekly report, I want to know what change from Devices Sending Telemetry Chart from Mar 11 - 2024, on the report The chart data is always divisible by 10 from Mar 11 - 2024 to now.
2.The chart of Detections this week from Sophos documentations : "The Weekly Report highlights the number of detections for the week, broken out by day and compared to the previous week."
This data has also changed the way it is displayed since May 13. I want to know what is detection, this data get from Case Activity or other data ?