Faint then clear then positive opk???

[GoldenRatio]

Hello ladies!


I have a question!!! I noticed this every month so I wanna know if it happens to others too. I start opks usually around cd8, I get pretty noticeable faint line until cd10-12 then it goes clear for two days and I get dark positive opk after two days of clear. I just can't understand why:/ I should have faint line all the time since my lh is high because of pcos but don't understand why it goes clear before positive???