Weird stuff being appended to link value on node titles

Hi

I think I've probably done something silly somewhere, but I can't figure out what, and would really appreciate some help.

The site is http://www.red-business.co.uk. I'm running 4.7.2, with CCK, Contemplate, Category (and all contrib sub modules), Path, Pathauto, and other modules that I don't think are relevant. It's in a multisite environment.

I'm finding that strange things are being added onto the links generated for the node titles when they are displayed in teaser view. Here's an example:

Link should be:
http://www.red-business.co.uk/red_business_volume_3_issue_08

But it actually is:
http://www.red-business.co.uk/red_business_volume_3_issue_08%22+rel%3D%2...

When I check what the alias is in Admin>URL aliases, they are all displayed correctly.

I've tried disabling Path, Category Pathauto, and Pathauto - with no luck. I tried disabling the overall drupal clean URLs, but then the links end up like this:
http://www.red-business.co.uk/?q=%3Fq%3Dred_business_volume_3_issue_08%2...

I've searched the forums, checked all the issue queues for modules that may be connected with this, but have found nothing.

Please would somebody more experienced point out what I've done wrong?

Thankyou very much!

cheers
Steve