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Problem was that 1 CharField of Model for saving IPN has maxlength=20, but recieved 40 symbols.
Thx jape he advised to add in form validation else statement and print form.errors
the error of of form validation was :
<li>ok_item_1_type<ul class="errorlist"><li>Ensure this value has at most 20 characters (it has 40).</li></ul></li>
Source:stackexchange.com