I'm registering a callback using s.registerPostTrackCallback() . In particular, within the console I'm testing with

s.registerPostTrackCallback(function(){console.log('test text')};

On the page, I click an object that sends an s.t() beacon and the network calls show that only one beacon fired, but the console is displaying

test text
test text

 What else could be executing this callback causing it to duplicate the expected output?