I cannot duplicate it doubling like that so it's probably a mod that you have installed that is causing this issue or its possibly a setting. I'm using my vB as a dev and there is nothing installed on it. Let's try this first:
Global disable: open your
includes>config.php file and find:
and under place:
Code:
define('DISABLE_HOOKS', true);
Save and upload again to your server in the includes directory.
If you find that it works after disabling the plugins globally then re-enable the plugins by putting // in front of the code so it looks like this:
Code:
//define('DISABLE_HOOKS', true);
Save and upload again.
Then you will have to go through your mods one by one until you find the one that is causing the conflict.