I have the same problem. It seems that the URL for "track order" isn't the waybill tracking information but instead is the same order number on the seeed website.
Are you using Firefox by the way? I noticed that is was missing when I tried Firefox, it is okay in Chrome and Opera.
The URL under the "Show Track" link is only the same URL as the actual order on the Seeed page, it does not contain the actual tracking link to the courier company.
Also, instead of just showing a link to the shipping details, add the actual waybill number instead.