Why does the same formula in google sheets work in one cell and not in another?

Question

Google Sheets

It's about the SUMIFS formula:
The same range for conditions, adjacent ranges for summation, the formula is simply stretched over several cells and counts somewhere, but not somewhere.

https://docs.google.com/spreadsheets/d/1w2rnhfR1V2...

Column "A", for example, cells A6 and A7

Answer 1

We messed with the cell format. Set all cells to "Auto Format" (see "Format" menu).