Hi Hax!! *waves* lol no it's not just you. If you made your dreads with backcombing, then the old part is all bunched up hair doubled back on itself etc, whereas the roots are just plain straight hair. They'll thicken up as they dread their way in, bending and changing shape. If you think the roots are getting too thin, you can beef them back up again with stray baby hairs.
I've noticed the same. If the new growth seems very thin when compared to the dread, I felt a thin string of wool roving and wind it around the new growth, wet it, and kind of work it into my hair so it stays. That helps to balance the weight until the new growth dreads in with the already dreaded hair.
well, the ends of my hair are the thickest part due to all the loopys and natural rounded ends that are forming, so yeah the new root part is thinner for me too.
There's probably like, loads of dead hairs that have fallen out your scalp but are still in your dreads too, making them thicker. But that doesn't really make sense, otherwise all your hair would gradually fall out. Ignore me.
No that is the reason why. New hairs grow in and don't allow it to fall out. Maturity is a beautiful point of static equilibrium where new hairs replace the shed hairs and width doesn't change.