Strange characters appear after SEO URL after page load

When I click on a page, it loads fine, then about a second later a string of random characters appears at the end of the URL.

This only happens with URL's that have SEO.

Does anybody know why this is happening and what it's purpose is?

Hi,

What Open Cart version are you using? Do you have any custom modules installed? Like ShareThis?
Can you paste here an example link?

Andrei

1.5.6.1

I have inserted ShareThis directly into my product.tpl.

The problem cause by addThis script. addThis add that string to track your site

To solve this, you can customize your script from addThis website to remove site tracking

I hope this can help

Thanks