Hi,
Thanks for trying to help us so well. Indeed, you are right, on the extra site we made so that a chosen few could get access to help us out with our getting started problems. And suddenly we discovered that the development site shows the problem with the quantities, but the extra site to which we gave you the right does not!
In the development site, for instance, if we change the quantity from 1 to 2, it results in 3. There is no way we could order 2 guitars, Hikashop forces it into becoming 3.
But like you discovered, in the exact-copy site in which you checked, Hikashop behaves perfectly normally! This is really weird, and explains why we were seeing different things. We saw the problems, but you could not see them.
We will do another back-up and restore to the other site, and if the problem still persists, we'll get back on the case.
Thanks for everything so far,
Cheers,
Marjoline