It seems like you’re encountering an issue with Unbounce’s call-to-action (CTA) button which is using an internal redirect before directing to the final external link. This is causing you to lose the ‘_gl’ parameter which is added by Google’s Cross-domain Measurement for tracking purposes.

While you’ve tried using JavaScript scripts found online, they appear to not be working. That could be because they are designed for form submissions, not for button clicks as you suspected.

I would recommend contacting Unbounce’s customer service directly for assistance, as they are likely best suited to help you solve this issue.

Also, it might be beneficial to seek help from a professional or forum who is familiar with JavaScript, Google’s Cross-domain Measurement, and Unbounce. They would likely be able to find a solution that incorporates all these elements.

Hope that helps!