I do not see anything in the code you posted that should lead to the subroutine input parameters to be inserted into @arrayToPrint. So, assuming I did not miss something (as I can't test your code right now), the problem must be in the code that you haven't shown.
As for coding improvement, yes, there are a few thing you could do. The main one, though, is to have these two pragmas:
use strict;
use warnings;
near the top of each of your programs and to declare your variables with the my keyword.
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