Are you using the redirect or are you using the CJ link structure? I don't see any double dips that I'm aware of, and I use the CJ link structure for everything.
I would rather not have CP mess with anything code related at this point in the year unless it's major. This IS an issue, but keep in mind that in the overall scheme of things, it's not as big as losing the affiliate sales altogether because of a code fix gone wrong.
I ran some numbers, and a double dip ends up being around 15% more income on that sale than if it were credited in the 7% VB tier and 3-4% less income on that sale than if it were credited in the 15% VB tier.
Base $16.99
Markup $6.00
Total $22.99
Income $6.00
Income with 7% VB
$7.19 Income being affiliated $4.80 (take off 20% of $6)
Income as an affiliate $3.45 (15% of total)
Income as a double dip
$8.25 Difference 15 %
Base $16.99
Markup $8.00
Total $24.99
Income $8.00
Income with 15% VB
$10.55 Income being affiliated $6.40
Income as an affiliate $3.75
Income as a double dip
$10.15 Difference -4%
(Someone feel free to check my math)
So, as you asked, is there anything WE can do about it? I *think* switching to the CJ structure will help, but I can't be sure.