Depends which kind of strips you are using. I think it doesn't show peak for other brands just easy@home ones so that might be why if you are using others.
Using e@h strips. High on the 10th, peak 11th, high 12th and still lowering but its not recorded the 11th as peak just shows high for all
What do you mean? After you get a peak depending on when you test next you'll get another high and then back to low after that and you ovulate 24-48 hours after you get the peak