I'm pretty sure what you are seeing is normal, and a good sign. I always had very brittle hair and nails while I was drinking. Now, my hair is much healthier, and I can actually grow fingernails for the first time in my adult life. But if you are concerned, maybe check with your doctor at your next check-up. But I'd say as long as the bottom portion looks good, you're probably just seeing the healthy new growth pushing out the old growth.