How can Parshurama be affected by sinful reactions?

” Lord Parasurama is an avatara of Sri Krsna. Srila Prabhupada has mentioned that when chant the mahamantra, Rama can indicate Balarama, Rama or Parasurama. In SB, 9.16.9, Prabhupada mentions in the purport: Lord Parasurama was also infected by in because of killing Kartaviryarjuna although this was not very offensive. Therefore whether one be Kartaviryarjuna, Lord Parasurama, Jamadagni or whoever one may be, one must act very cautiously and sagaciously; otherwise one must suffer the results of sinful activities.

However, Sri Krsna and his incarnations (svamsa avataras) cannot be touched by material sin- they are transcendental. So how should we understand this purport? “