There is only one %resultarray and it lives as long as any of you other variables -- each time you take a reference, its to the same variable

The shortest fix is to use

push @AoH, { %resultarray };
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To learn how to avoid this problem see:

Tutorials: Getting Deeper Into Perl: Variable Scoping in Perl: the basics

Tutorials: Getting Deeper Into Perl: Coping with Scoping

For an example of the same problem see parse xml and store data in array of hashesh