Software: MS Excel 2016 Power Pivot
TOTALYTD acts as sum for each time period rather than a cumulative.
I have a separate Calendar table in Power Pivot and I created relationship with my main table.
Here is the formula
YTD_Matches:=TOTALYTD(sum(Complete_Detailed_Incidents[Matches]),'Calendar'[Date])
When I create Pivot, below is what it looks like. How to fix this?
If you have more than one year in your model, you will need to put year on rows also.
Otherwise the issue is something in your model (something you have not shown).
I was able to create a cumulative year to date using your numbers in an Excel 2016 workbook which you can download from this link.