I tested 3 affiliates, first one without recording, everything went as planed.
second time I created (for the affiliate tutorial) another affiliate, when I bought through the second his link, the first one got the referal commission.
the third time I cleaned the cookies of my computer and bought again through the second affiliate, but is was granted to Direct.
Sorry, what went wrong?
it seems that the second time was not used well the affiliate link.
If you want, you can send web access to support at itthinx dot com and we have a look.