$_GET['q'] and $_REQUEST['q'] have prefixed slash

In securepages.module there are matches to $_GET['q'] and $_REQUEST['q']. I'm getting an extra prefix slash in my redirects due to the prefix slash not being taken out of Drupal (I think).

For instance, http://my.site.com redirects to https://my.site.com//admin (note the double slashes before admin) when I click on the Administer ink.

The easy solution is to replace all the lines referencing $path to trim out the slash, I guess:
$path = !empty($_REQUEST['q']) ? trim($_REQUEST['q'],'/') : '';

But is this because of a configuration issue somewhere? I'm running 6.10