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This depends on the email client / webmail that you use, but in general each allows you to break threads and show all emails as a single email instead.
Alternatively, you could change your forms title so that it shows a unique entry, like users full name, or submission ID, etc (depending what serves you best).
New Submission has been made by Ben D.
a new email would have different ending so it should not become the same thread, like:
New Submission has been made by GrandTrunk
Hope that this helps.
The following guide will assist you in the steps on changing the email subject: How to place form title in the Subject Line of form notification?