Can anyone affiliated with scrapbook.com and computerscrapbook.com explain to me why they don't payout on most sales generated?

Does anyone else have this problem?

For the month of November I showed 20 sales made in my activity details reports, but out of those 20 sales I made commissions on 6.

Most of the unpaid sales are from computerscrapbook.com.

I'm a affiliate of both programs.

Thanks for any information you can provide.