Why am I getting thin bald lines on my head? (photos)

I have had hair loss for the last 2 years (diffuse all over on the top, worst at the crown). I have been taking finasteride for the last 6/7 months and think I am finally starting to see some growth. However, I have noticed that I have a lot of strange bald lines going all across my head, front to back. Can anyone think of why or how I can help reverse this? I cut it every week with a No.1 clippers, in a similar direction, don't see why it could be that though. Any help appreciated!