This is not a problem in Perl. You told Perl what to do:
$tmpContent->{'SWITCH'} = $switchValues;

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You probably meant this:
my $tmpContent = { %$setSwitchValue };

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i.e. do not assign a reference to the old value to tmpContent, but a reference to a newly created hash with the values you want to keep.

In reply to Re: Perl. Problem with HASH value by choroba
in thread Perl. Problem with HASH value by breeze

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