What you say doesn't make sense - as I've often had people purchase product without going to an affiliate link and no 'affiliate get's paid for it, nor credited to it.

[side thought - or do you mean to say that it only happens with that script. Oh. OK).

But just between me and you, I'd rather get paid the full sale value of any sales on my products that I generate myself than have them given away to some affiliate that didn't do the work for it.

Paul Barrs