The issue is, only the referred account can grant levels, the account which made the referral cannot grant levels. In your case the original account you referred from is A and so this account cannot grant levels. I think this was done so that people did not do a back and forth of granting levels between the RAFed accounts, seems logical that people might have tried to grant a level to a toon which was really close to the next level, then hit the next level and grant a level back, kind of leapfrogging through their levels.