Bests & Worsts Reviews from Amazon

I purchased these keto strips a couple weeks ago and up until I went to use one today, they've worked great. I have always followed the directions to a T. I used a test strip 2 days ago. Worked fine, looked fine. Didn't test yesterday. Tested just now, and as soon as I took one out, I immediately replaced the cap like I usually do. However, I noticed the test strip was already yellow/orange. I got another one out, same thing. Decided to take them all out to check out what was going on...and they're all yellow/orange?! Not white like they're supposed to be. Not sure what happened, but hoping I can get a replacement to try them again and change my review to 5 stars because I really liked these up until this issue today.