Confused and annoyed

Victoria

So I had the exact same thing happen the last 2 months. Positive opks on cd 13. They then fade off negative but again back positive on cd18. Why would this happen 2 months in a row? I skip the flashing smiley completely both months. Never got a flashing smiley. Went from solid circle straight to solid smiley. So now I don’t know if I actually ovulate cd13 or cd18 😩