My experiment with clearblue

I have been using clearblue for a few months and I have saved five of the nine I’ve purchased. These are clearly not wallet friendly, but claim 99 percent accuratcy.

i had my first solid smiley the 31st of January. I most likely ovulated the following day. I have a 28 day cycle. I have four children and I don’t have pcos. 
After the solid smiley had stayed for 48 hours had passed I tested again and got a solid peak smiley again on two of my readers after second urine stream. For seven days total up until an hour ago, according to all five of my tests, I’m somehow showing five solid smileys. 2 of which I retested after 48 hours and they are peak again. If I have no underlying medical conditions why would this be happening? Why would the company say we don’t need to test anymore after we get a solid smiley when that clearly isn’t the case? Why wouldn’t the test just read low fertility after peak?