Hello. I would first recommend testing your form without the code in this HTML field, to see if this code is responsible for creating multiple entries.
If that does not make a difference, the next thing to check is the date and time, IP address, and user agent of the entries. It’s possible the tab in the browser is responsible for creating a new entry each time the browser is reopened. This happens mainly on mobile devices, and the entries can be minutes or hours apart.
If you need additional assistance, I recommend opening a support ticket, and including a copy of your system status report. Thank you.