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Hi @samruddhi
WordPress core includes duplicate checking that all form submissions are passed through. Here’s some information that might help get you pointed in the right direction.
https://formidableforms.com/knowledgebase/why-am-i-receiving-duplicate-entries/
Our Pro plugin includes other options that can be used to prevent duplicates. If you have a Pro license could you please open a ticket in our helpdesk about this and our team will be happy to help: https://formidableforms.com/new-topic/
Best,
Nathanael