Sometimes triggers, when configured improperly, can yield unexpected results in Google Tag Manager. When you configure triggers, consider the following best practices:
falsebefore the form or link trigger is reached, and the trigger code is skipped. Use Tag Manager's preview mode to test if a tag fires properly or if form data is sent properly.
Test in older web browsers: Older web browsers can have problems with tag behavior. These issues are far less common in modern web browsers. If your product requires support for older browsers, test thoroughly with preview mode before deployment.
Limit the scope of form and link triggers to tested pages: Testing every page on your site can be time consuming. Be judicious in how you configure triggers, and be especially careful with triggers that listen for form submissions or link clicks. Use filters to ensure that your trigger will only fire when specified conditions are met (e.g. "Page Path equals /my/tested/form/page".)