Fix GA4 counting more form submissions than you received

1. 1Open tagassistant.google.com and connect it to your website address. Tag Assistant adds a parameter to the address that turns on debug mode for your browser. If the site shows a cookie banner, accept analytics cookies first: DebugView shows nothing without that consent.
2. 2In GA4, click Admin and, under Data display, click DebugView. Choose your browser in the Debug Device list if more than one shows.
3. 3Fill in your main lead form once with test details and submit it. In the Seconds stream, count the form_submit events and any lead event, such as generate_lead, that arrive for that one submission.
4. 4Click the form_submit event to see its parameters. form_id and form_name tell you which form fired, and form_destination shows the address the form posted to.
5. 5Now use the site's search box once, and any newsletter, login or quote-calculator form once each. Write down every one that sends form_submit.

1. 1form_submit from a search box or newsletter form. GA4's enhanced measurement sends form_submit when a visitor submits a form, and Google's description draws no line between a lead form and any other form on the page. If form_submit is marked as a key event, every site search counts as a lead.
2. 2The same lead event twice for one submission, or two events both counted. Two generate_lead events (or two of any one lead event) for one fill mean two installs send it, such as a website builder's Analytics setting and a tag in Tag Manager; two installs usually double page views too, and the page on page views counted twice covers removing one. One form_submit plus one generate_lead is normal, but DebugView does not show which events are key events: check Admin > Events > Key events, and if both are starred, one fill counts twice.
3. 3One event per fill, but still more than the leads you received. Some forms send their entries somewhere other than where you collect leads, such as a third-party booking or chat widget, or an old form address. Compare the form_destination values from DebugView with where your leads actually arrive.

1. 1If the form shows its own thank-you page, create the event in GA4. Open Admin, under Data display click Events, then click Create event. Name it generate_lead and base it on page_view with the thank-you page's address as the condition; Google's newer screen calls this Create without code.
2. 2If the form shows no thank-you page, have the site send generate_lead when a submission is confirmed, and fire a GA4 event tag of that name from it in Tag Manager. Google lists generate_lead as the recommended event for a visitor who submits a form or a request for information.
3. 3In Admin > Events, find generate_lead in the Recent events tab and click the star next to it to mark it as a key event. A new event can take a while to appear there; Google lets you mark it ahead of time with Mark as key event when you create it.
4. 4Open the Key events tab and deselect the star on form_submit, so it stops counting as a lead.
5. 5Once generate_lead works, decide whether to keep form_submit at all. To stop it, open Admin > Data streams, click your web stream, and under Enhanced measurement edit the options and turn off Form interactions. Leaving it on is harmless once it is no longer a key event.

Every change counts from now on. Google says created events do not apply to historical data and unmarking a key event leaves past data in reports as key events.