Maybe this...
http://perldoc.perl.org/CGI.html#PRAGMAS
-nosticky
By default the CGI module implements a state-preserving
behavior called "sticky" fields. The way this works is
that if you are regenerating a form, the methods that
generate the form field values will interrogate param()
to see if similarly-named parameters are present in
the query string. If they find a like-named parameter,
they will use it to set their default values.
Sometimes this isn't what you want. The -nosticky pragma
prevents this behavior. You can also selectively change
the sticky behavior in each element that you generate.