using Numbers SUMIFS formula: some formulas in my spreadsheet work and others don't
I am creating a spreadsheet to track our expenses. I have created 100+ categories and have entered the category and month in a column across from the transactions I downloaded from US Bank for each of the year's 2500 + expense transactions. I have created a grid that lists the categories on the vertical axis of the grid and the month names on the horizontal axis. Each cell has a formula that sums all the transactions for that category and month. Most of the cells are giving me the answer I would expect. Others give me answer of $0 with no error message when there should be a number other than $0. I have checked the syntax carefully and had others do the same.
Can't figure it out. Any ideas?
thanx
MacBook Pro 13″, 13.5