Error On All The Links Received By Clients

Some clients have contacted me as the links they receive on their emails from stylist don't work. For example if they forget their password the email they receive has 3 links and all of them send to this address: https://ppphotography.com.auppphotography.com.au/stylist/index.php?view=resetpassword&rt=a549bfe7a3aa712255d24008dd33638c

So for some reason it has pphotography.com.au added twice to the address.

How did this happened and how can I correct it?

Sounds like you modified the config file and changed the $setup['url']  value or the temp_url_value.

The $setup['url'] value should be: 

$setup['url'] = "http://".$_SERVER['HTTP_HOST']."";

Thanks Tim, that did the trick. It was my hosting "supp" team who modified it to try to get the cron to run.