Results Spreadsheet

Range AA7 value is equal to "Server1-Single"
Range D7 value is 10

Counter Spreadsheet

Range A4 value is "Server1"

Formula in Range B4 is

=SUMIF(Results!$AA$7:$AA$1000,A4&-"Single",Results!$D$7:$D$1000)

Shouldn't this give me a value of 10?