That should not happen and more than likely you are mistaken. RAF ends at level 80. Any toon tagged to the Booster would stop receiving triple XP as soon as the Booster hit level 80.
Booster = acct A
RAf 1 = B
RAF 2 = C
B raffed to A = no XP when A hits 80 or more than 4 levels above B
B raffed to C = triple xp till 80
yes The B and C would be getting normal xp from the A kills but since they are Rafed together there xp gain is tripled... ill send you a ss of it saying in the combat log the recruit a friend bonus xp if you want?