Why my hair bulb is so small??? Does this normal and new hair will replace it in future???

I had my hair transplant 6 months ago. From the last 4 weeks I am observing that while combing 10 to 15 hairs comes out when I start to see that the hairs is falling due to breakage or shedding with naked eye then I don’t see any white bulb but when I used magnifying glass then I see the very small white bulb at the end of the falling hairs.