Why are the bottom part of falling transplanted hairs curved in 90° angle? (Photos)

This is my 21th day post op . I had done fut procedure for about 4000 grafts and now a days i'm seeing hairs are falling . that's okay i know it is normal phenomena but i am seeing the bottom part of maximum hairs are curved in 90° angle . i've sent picture marking the bottom part .. can you tell me why the the bottom part of falling hairs are curved ? are the roots also falling along with the hairs ?