I would like to know why I am reciving double entries from participants

I would like to know why I am reciving double entries from participants.

Best regards,

Asma

Are you receiving duplicate submissions? To which form is your issue related to?

Maybe your users are submitting the form multiple times. You can prevent duplicate submissions with the Unique Submission and Unique Question features. 

How to Set Unique Submissions on a Form

How to set Form Limits Based on a Unique Question