I have a formula that attempts to use SUMIF to sum a range that includes two
columns.

=SUMIF(C3:C500,C3,D3:E500)

The result of this formula is the sum of column D only.
I had to break it down as follows:

=SUMIF(C3:C500,C3,D3:D500)+SUMIF(C3:C500,C3,E3:E500)

Is this normal behavior or is something wrong?

--Carlos