Hi,
when you code

$FORM{$field} = $query->param($field);
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you are asigning $query->param($field) to an scalar, but it is an array, so you are obtaining the last element of the array.

In CGI documentation you can find

@foo = split("\0",$params->{'foo'});
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but I would code this:

@array = $query->param($field);
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and you will have an array with the parameters.

Hope this helps
Hopes