Noticed weird top of hair pattern.

[Thinkitshairloss]

Hey, second thread posting here. My last post as about my worry regarding my what seems to be receding hairline, though now I've noticed a strange pattern suddenly formed on the top part of my hair. I've noticed it does feel a little thinner in certain parts on the top. Looking back at genetics. I tell you now it is strange. On my father's side. My dad still has his hair now at 50 no receding hairline though just a little thin. His dad still has all his hair, he's 72.
My Mum has no signs of hair loss. And her dad did have a fairly receded hairline though kept his hair on top in the middle section, so just the temples receded, he's 80.

Taking a look at the norwood scale, I'm a little confused.
Here are pictures of my hair dry and brushed back completely yet look at the strange line.
It's freaking me out guys.
What do you think? Please help me calm down.