Double Submission Issue

I mentioned this a couple weeks ago, but unfortunately, we’re still dealing with duplicate submissions. It seems to happen 50% of the time, and I’ve never been able to replicate it myself.

The form is a simple data entry form for reserving accommodations at a golf course. The site uses Wordfence and Cloudflare, but otherwise has no caching or security plugins. We are not using any WP Form add-ons.

So far, we’ve tried the following:
– Enabled ajax form submission (and disabled it)
– Tried reCaptcha and Turnstile, and also tried without any captcha protection
– Completely disabled Cloudflare
– Removed all caching plugins

No matter what we try, the double submissions still happen. The submissions have the exact same time stamp each time, and are 100% identical except for the entry id. The form functioned without issue until October 10, which is when this started happening. Last but not least, this problem seems to always happen if the user is using Chrome. On other browsers, it can happen, but only about 20% of the time versus almost 100% of the time with Chrome. The device used does not matter (it impacts mobile, Mac, and Windows).

At this point, I’m pulling out my hair trying to figure out why it’s happening and how to stop it.

The page I need help with: [log in to see the link]