it is not about duplicate, etc.. but since last week in different websites that I'm using formidable I'm getting this error, after sumit the form, and it came from nowhere, I relaized the issues, because google analitics was not tracking my registration, since I have the goal page as a thank-you page, 
the error is on the same screen as the form like whne you have a message after submit the form.
 We're sorry. It looks like you've already submitted that.,
 
"it is weird, time by time this error are coming back and goes away without I make any changes, but I never submited before, including going on incognito window, other computer, it doesn't matther I'm using only the honeypot for spams"
 
now I added on the funtion.php the line , but I'm still getting the error message
 
add_filter( 'frm_time_to_check_duplicates', '__return_false' );
 
anyone had this issue and find a solution?