You should only have URL parameters at the end of your Website URL at the ad level:

Under the 'Website URL' section, scroll down to the bottom under the 'Tracking' section and make sure that you do not have any URL parameters in the section below:

If you have URL parameters at the end of your Website URL and in the URL Parameters section above, Cometly will not track and attribute sales. Only have URL parameters at the end of your Website URL.