If you are working on Cloudflare with the "Rocket Loader" the execution of the tracking script will be escape.
You can have Rocket Loader ignore individual scripts by adding the data-cfasync="false" attribute to the relevant script tag.
1. Adding this attribute within JS will not work to exclude the script from Rocket Loader.
2. The 'data-cfasync' attribute must be added before the 'src' attribute.
3. Rocket loader will recognize the tag when either single or double quotes are placed around the attribute value.