SPSS computes Fleiss Multirater Kappa instead of Cronbach Alpha

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Im having difficulty computing Cronbach's Alpha on a measure's subscales. The subscales are all likert ratings, of which the variables have been set up as ordinal string variables with 7 (0 to 6) values. When I use Analyze>Scale>Reliability and put all relevant subscales into ratings, set Model as Alpha and compute I get a Kappa output and not Alpha. Can anyone tell me what I am doing wrong? Thanks!

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