Nested if function showing "False"

    Monday      Tuesday     Wednesday       Thursday        Friday      
09:00 - 11:30   ALL                                     
11:30 - 13:00   Elliot      Marc        Marc        Vera        Vera        

13:00 - 15:30   Marc        FALSE       FALSE       FALSE       FALSE       
15:30 - 17:00                                           
                    1   2   3   3   2       
                    1   1   1   2   2       

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Formula for Tuesday =If(D5 = "Elliot",Choose(H10,"Marc","Vera",elseif(D5 = "Marc", Choose(H10,"Elliot","Vera"),elseIF(D5 = "Vera",Choose(H10,"Marc","Elliot"))))) Formula for the rest =If(F5 = "Elliot",Choose(J10,"Marc","Vera",if(F5 = "Marc", Choose(J10,"Elliot","Vera"),IF(F5 = "Vera",Choose(J10,"Marc","Elliot")))))

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Any ideas why its returning False? it returns "Marc" on Tuesday due to the first IF query being correct but if incorrect it doesn't move onto the next if query?