Wrong values displayed when viewing data by different dimensions

Hello,

New to Tableau, and this might explain a lot my question:

I am connected to a HANA query and have a few calculated measures, which work according to the data source.

However, when looking at these measures by various dimensions, the total value changes.

Below are some print screens showing the same "Total splits" measure having different values depending on the dimension. There are no filters and the data in the background is correct.

Where/ what should I check?

Thank you