Manual shipping problem

I added 30 or so new shipping options via the manual shipping plugin and decided to put them in the correct order. After changing them to the correct order I clicked the order icon. Instead of putting my products in order, it has duplicated my 30 I had originally to 1400. There does not seem to be an option to check what I don't need and delete it all but have to delete them 1 by 1.
Is there a database for only this section which will be easier to delete/modify?

I have Windows 7, IE 9, Joomla 1.6 and the latest Hikashop - (You have the latest stable version : 1.5.3)

Website:

www.rchelicoptersandhobbies.com.au/
No payment methods are currently published until this issue is sorted out. (Sept 2011)

Any help would be greatly appreciated

Thanks Nicolas, worked as suggested. Thanks for quick response. I will await new update

Empty the table jos_hikashop_shipping in the database via phpmyadmin.I think this will work hopefully for me.

I hit this problem myself, today. Ironically, this ‘quirk’ was actually helpful, because I was creating about eigthy-five new Manual Shipping Methods and I was able to use each 'copy’ for my next new method.