I’ve been TTC for months and they seemed fine I thought it’s just my problem

I’m the wife of this holder. I’ve been TTC for months and they seemed fine I thought it’s just my problem. I went to the hospital found out we are alright. But when I ordered a new box for this month and half of the strips show this(half T line only after waiting for 15 mins). Now I just wonder this brand didn’t detect right cuz me not be able to succeed.

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