Manual shipping methods....something is not right

-- url of the page with the problem -- : www.BestederNewsletters.com
-- HikaShop version -- : 2.3.0 (Essentials)
-- Joomla version -- : 2.5.8
-- PHP version -- : x.x.x
-- Browser(s) name and version -- : XXXXX x.x.x
-- Error-message(debug-mod must be tuned on) -- : Error_message

I have configured several different manual shipping methods based upon product weight:

Then, in my product, I included the weight of the item:



Then, I did a product order with 1 item and the shipping came through just fine:



I changed the amount to 2 items and...again...just fine

However, when I changed the number of products to 3....the shipping cost disappeared:



But just out of curiosity...I changed the amount to 4 items and....the shipping costs came back!!!




And to top it all off.... when the shipping costs disappeared when I changed it to 3....the system gave me this error message:
The cart items combined weight is too big for all the possible shipping methods

What is going on?

Yeah that worked....YOU are my hero!

Thank you!