Characteristics and Variables...I'm confused

-- url of the page with the problem -- : bestedernewsletters.com
-- HikaShop version -- :2.3.0 Essentials
-- Joomla version -- : 2.5.19
-- PHP version -- : x.x.x
-- Browser(s) name and version -- : XXXXX x.x.x
-- Error-message(debug-mod must be tuned on) -- : Error_message

Customers can sign up for a service based upon the size of their unit (team of agents) for postal mailings to the team
0-50, 51-75, etc. and pay a base price (YOUR UNIT SIZE)

Once they choose that base price, if they want to upgrade to add more mailings, they choose ADD MORE MAILINGS

So far so good....I have successfully created characteristics and variable so no matter what combination they choose, the amount is correct. Hooray!

However....I have run into a problem when I add a 3rd option. Here's what my variable page looks like when I have ONLY 2 of the characteristics: Notice it is showing only 4 items:

Add more mailings (the default when the customer doesn't want more mailings
10 mailings
15 mailings
All mailings

I put a red box around the 10 mailings to show it's only listed once



Now, when I add the 3rd characteristic and go to input the price for the variables, it gets really confusing. This 3rd variable allows them to add an option of a blanket mailing regardless of size for an additional $20.

Here's the variable page now...notice that there are TWO rows for 10 mailings!!!! WHY are there 2 mailings and if that's correct, WHICH ONE do I update?