Grey hair grow in donor area post FUE Is it normal and will remain like that now?

Hello, I am into my 6th weeks post fue, and I noticed more grey hairs than before the transplant in my donor area. Is it normal and will remain like that now? I've made research on internet about the situation, but there is not much sources about this phenomenon, expect an article speaking about this side effect on wanted Rooney ( british Footballer). Thank you in advance for your time and answers.