Why are procedures behaving differently in package?

Dismantlimg a polynomial  uses the following 2 procedures

Notepad file to Create AlgCalc.

AlgCalc := module ()
export SignedArea,
           `⊕`,

             getCP,

             diag,
             diftab,
             faulD,
             faulS,
             FundThrm;
        

 option package;

$include "SignedArea.mm"
$include "`⊕`.mm"
$include "cpsub.mm"
$include "getCP.mm"
$include "diag.mm"
$include "diftab.mm"
$include "faulD.mm"
$include "faulS.mm"
$include "FundThrm.mm"

end module;