Beard transplant 18 days ago, the transplanted hair continues to grow and doesn't fall out like it is supposed too.

It is normal to shed transplanted hairs weeks after surgery.  The new hairs may take 6 to 12 months to grow.

Because of the great vascularity in the face, it's not uncommon to see some of the hairs grow right away and not shed.  That said, it is likely that you will still experience some delayed shedding so do not worry about that.  I personally love doing facial hair transplantation with the ARTAS robot.  They are very rewarding procedures.  Best of luck!

If you don't shed within the first 6 weeks and see growth continue, celebrate that you are one of the lucky ones.