Is this invalid?

Question

I got a smiley 21 hours ago? I bought another holder to make sure then it does this.

Answer

I found this online and thought it was super helpful because I had no idea! 
“Please be advised you should use the same Digital Holder consistently during one cycle of testing, as the Holder tracks your hormone changes and stores this information for one cycle. If you run out of test sticks use the original Holder with the new test sticks to complete testing. The new Holder will show you Low Fertility as it has just been introduced and has no previous information from the current cycle”

Is this invalid?

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