Error on submission: "Sorry! Only one entry is allowed."

We are getting this error on forms, no idea why, we want duplicate entries if they come through anyhow. Please help. 

  Sorry! Only one entry is allowed. Multiple submissions are disabled for this form.

You can set the Unique submission option to No check to allow duplicate submission from your form settings.

Please follow this guide to know how you can do this:

https://www.jotform.com/help/64-How-to-Set-Unique-Submissions-on-a-Form

Hope this will help.

If you have any further query, please let us know.

After the latest updates, is this a function that is auto set now? This has never been an issue in the past. 

The Unique submission option generally auto set to no check but it might happen that in some case there could be a check to disallow duplicate submission in a form.

We normally suggest to change the settings to "No check" so customer can allow duplicate submission to their users based on their requirement.

If you have any further query, please let us know.