I am perfectly aware of this, but as this problem seems to be shared among many users, maybe - as a publisher - you could have more "weight" in asking for an explanation. I contacted their support anyway, but as for now I did not receive any reply. In case I will, I will let you know
That was a poor choice of words on my part. The issue here is that a tiny percentage—less than 0.1%—of offers have problems. Due to the way the offerwall system(s) are implemented, the relationship that effects those individual offers is the one between the user and the offerwall. We see only what the offerwall tells us, giving us (and other offerwall hosts) no role in crediting for the claim process other than giving our members what the offerwall tells us they earned.
Mind you, that less-than-0.1% figure doesn't make it any better for those who experience problems. As I've noted before, I've personally experienced my fair share of claims that didn't go through over the years. It's definitely frustrating.