I have a table where I added a table filter to do sum calculations automatically. We work with merged cells, since one PO can be linked to several invoices.
Somehow the calculation doesn't calculate the merged cells properly, instead it seems to add it up for every line. I think the picture shows the problem:

The proper sum should be 31.000 but it seems to multiply this number by 3, since there are 3 merged cells?!
Any hints how to fix this?