django request.POST data caching

hi have a template with a form and many inputs that pass some data
trough a POST request to a view, that process them and send the result
to another template. in the final template, if i use the browser back
button to jump to the first view, i can see again old data. i refresh
the page and i insert new data, i submit again but some old data
remain when i see the final view. the problem remain even if i restart
the debug server. it seems that there's some data-caching that i can
solve (and somethimes not) only flushing browser cache. this is the
view code: http://dpaste.com/640956/ and the first template code:
http://dpaste.com/640960/. someone on stackoverflow.com that is cache
navigator and suggest me to use a custom middleware to disable it:
http://stackoverflow.com/questions/7921457/django-post-request-data-caching,
so i followed the advice. i also added the pragma no cache meta tag in
the html head section, but none of these helped. the problem remains.
any suggestion?

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