Clickbank Experts - Am I being hacked?

Hi all,

Hope someone can help me.

I noticed when I see one of my sites listed in google the search results that it displays of my url is shown like this:

www.mysite.com/?hop=12345

The problem is my hop is not the one displayed in google results page. When I click into the site it shows the same incorrect url is the address bar, like in the url above.

But then I click through to the clickbank salespage and then go to the order form, and my hop id is correct.

When I click my link on my site to go to the clickbank page, I send it through a sub page where I do a redirect and set my cookie. My hop isn't even set until I click one of the links on my site. That is why I can't understand why it would be showing any hop on the home page.

Is this someone trying to hack my site or has anyone else noticed something like this in their search results and this is some weird google display error in their search engine results?

Where would I look to check and see where the hacker would be setting the url up like above?

I am at a total loss.

Thanks,
Terry