I have a soft spongy gum tissue growth over one of eight, implants... is this normal?

8 weeks post op, 8 upper implants, implant in back has soft spongy gum overgrowth...all other implants are covered by firm tight gum tissue...I'm 56 year old male, non smoker no alcohol and take very good care of implant areas...this one area stands out because of the soft spongy nature of the gum over it, it is totally painfree...thank you