Receiving Form submissions for deleted form

My client runs a promotion on their site every year where customers complete a basic form for a free desk calendar.

This year it’s time to run the promotion again, so I amended the page title, meta data and form name from ‘2023’ to 2024’, and published. I also did a 301 redirect on the old 2023 page to 2024 page.

I can see in the Forms tab of the Editor the client is still getting recent form submissions for the 2023 form, despite it no longer existing.

How are users submitting forms via a form that no longer exists? They are not spam submissions either.

For example, the most recent submission was only 5 days ago for the 2023 form, but I have no idea how they’ve done it?!

Here is my site Read-Only: [LINK](Webflow - Fixfire)
(how to share your site Read-Only link)