I was doing some design tweaks to the form today, barely touched coding parts and than I went for a test run to see if it submits an entry. Everything run as it was on the front end except on the back end I got 3 same entries created with ascending IDs every time an entry is posted.
I was going through and through the form for hours, but ... aaargh!
If anyone has a theory of the issue without seeing the code, post it here please. Otherwise I will submit the code. It's extensive thought.