You just need to remove Ifferror formula. use below one.
Formula:
=IF(INDEX(Outcome!$B$5:$B$9,MATCH(Event!C1,Outcome!$A$5:$A$9,0))=C3,2,0)+IF(INDEX(Outcome!$B$5:$B$9,MATCH(Event!E1,Outcome!$A$5:$A$9,0))=E3,2,0)+IF(INDEX(Outcome!$B$5:$B$9,MATCH(Event!G1,Outcome!$A$5:$A$9,0))=G3,2,0)+IF(INDEX(Outcome!$B$5:$B$9,MATCH(Event!I1,Outcome!$A$5:$A$9,0))=I3,2,0)+IF(INDEX(Outcome!$B$5:$B$9,MATCH(Event!K1,Outcome!$A$5:$A$9,0))=K3,2,0)
or you can use below one
Formula:
=IF(ISNA(IF(INDEX(Outcome!$B$5:$B$9,MATCH(Event!C1,Outcome!$A$5:$A$9,0))=C3,2,0)+IF(INDEX(Outcome!$B$5:$B$9,MATCH(Event!E1,Outcome!$A$5:$A$9,0))=E3,2,0)+IF(INDEX(Outcome!$B$5:$B$9,MATCH(Event!G1,Outcome!$A$5:$A$9,0))=G3,2,0)+IF(INDEX(Outcome!$B$5:$B$9,MATCH(Event!I1,Outcome!$A$5:$A$9,0))=I3,2,0)+IF(INDEX(Outcome!$B$5:$B$9,MATCH(Event!K1,Outcome!$A$5:$A$9,0))=K3,2,0)),"",IF(INDEX(Outcome!$B$5:$B$9,MATCH(Event!C1,Outcome!$A$5:$A$9,0))=C3,2,0)+IF(INDEX(Outcome!$B$5:$B$9,MATCH(Event!E1,Outcome!$A$5:$A$9,0))=E3,2,0)+IF(INDEX(Outcome!$B$5:$B$9,MATCH(Event!G1,Outcome!$A$5:$A$9,0))=G3,2,0)+IF(INDEX(Outcome!$B$5:$B$9,MATCH(Event!I1,Outcome!$A$5:$A$9,0))=I3,2,0)+IF(INDEX(Outcome!$B$5:$B$9,MATCH(Event!K1,Outcome!$A$5:$A$9,0))=K3,2,0))
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