Sorry, but your code is a mess, and no fun to debug.
If you want to get the dir in which the script lies, use FindBin].
If you call header() from CGI, you should actually send HTML - that starts with a doctype, <html> etc. - not with <br>.
If you want to use proper HTML templates, consider using HTML::Template, Template, HTML::Template::Compiled or the like.
If you want to escape "dangerous" characters, I recommend HTML::Entities.
I assume that doesn't fix your original problem, but it might clean up your code significantly.
BTW you are comparing "Insert" with "insert" - that will never work.
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