Not able to submit form for a second time from same machine

Hi, I have created an idea submission form but when i try to submit two ideas from my machine or from my browser, It shows a warning as only one is allowed. How can I remove this condition.

I tested your form but I wasn't able to replicate an issue.

The form is submitting fine and unique submissions option is not enabled (that could cause such problem):

If you're still experiencing this issue, please let us know.

Thank you!