Okay, so you did the twist & rip, so did I. That method is not dreads at all, but he placement of sections where you want your dreads to be. The process of mature dreads is 1-2 years. Here are the changes to expect: The sections you made will loosen, or maybe even fall out. They will start to form all crazy shapes, looping, zig zagging, shrinking, fattening up, pieces sticking out, frizz will happen to you shortly. It is doing what it should do. The weird shape you are worried about is the hair moving around to do its thing.
The dread APPEARANCE you made with the method only lasts for a short few days, and then they go on their journey! That is what your hair is doing now. You have done nothing wrong. With T&R, just make sure all the sections you made are 1" or less in diameter, due to drying times, fatter than that they can take 2 days or so to dry once mature.
You have begun your journey now, all you have to do is keep them clean, sit back, and let them do their thing. There is no worries, just sit back and enjoy the funky, crazy, wild ride and you will be rewarded with a head full of beautiful dreads. I won't lie, some days you will need patience and on those days just put on a tam to cover your hair, the next day is a new day!......Peace