help to read ovulation sticks!

Yve
I'm so confused! I took a test CD 13 and it seemed like I was ovulating, then it seemed to get lighter by CD 15. I have the rest numbered 17,18, 19, 20, 21, 22. Today is CD 22 and it looks dark again! What's happening!?  Please someone guide me. I can't figure it out. 

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