11 weeks after hair transplant, is it normal that not all the grafts will fall out?

Everyone will have a different experience to any treatment. If you have concerns see your doctor for an exam.  In general transplanted hairs will shed over several weeks.

or not falling can both be normal.  After 11 weeks, things should be pretty stable but you can always go  in for a follow up to be sure.

Sometimes some of the hairs in the grafts will remain and possibly even grow a few months after the transplant was done