Pop up form Issue - customer can go to next step when submitting form stuck on loading

Hi ​@Wohpe - this is a frustrating issue but usually a sign of one of the following:

1. Klaviyo Site Code Missing or Misconfigured

   Double check that the klaviyo.js snippet is installed once on your site. If it’s missing, duplicated, or placed incorrectly (e.g., inside an iframe or conflicting script), form submissions can get stuck on “loading.”

2. Form Fields Not Mapped Correctly

   It looks like you’ve added a custom field like birthdate, make sure they’re properly mapped to a Klaviyo profile property. An invalid field or date format can silently block the form submission.

3. List Issue

   Go to Klaviyo > Signup Forms > Select your form > Check the “Submit actions” section and ensure a valid list is selected. If no list or a deleted list is tied to the form, it won’t complete submission.

4. App Conflict or JS Error

   Sometimes Shopify apps or theme code conflict with Klaviyo forms. Try submitting the form in an incognito window with all browser extensions off. If it works there, there’s likely a script conflict. You can also check the browser console (right click > Inspect > Console tab) for red error messages.

5. Re-Publish Form

   Even small edits can sometimes cause glitches. Try unpublishing the form, refreshing your Klaviyo dashboard, and publishing it again.

If none of that works, feel free to share the page URL here and I can help inspect it!