[support] How can I get the ubercart "add to cart" link to save so that it saves a string to an attribute instead of an array (which has 1 element containing the string) to the attribute?

I am having differences when I add an item to an ubercart shopping cart when I click the "add to cart" button within the product screen and when directly clicking the "add to cart" link (i.e. https://mydomain/cart/add/p107_a4o1234)

If I click the add to cart button within the product screen then it assigns the string 1234 to attribute 4 but if I directly click the "add to cart" link (i.e. https://mydomain/cart/add/p107_a4o1234) then it assigns an array which has 1 element containing the 1234 string.

How can I get the ubercart "add to cart" link to save so that it saves a string to an attribute instead of an array (which has 1 element containing the string) to the attribute?

Thanks,

John