Frozen “reading” on clearblue OPK

So this is so random... high fertility readings all week... due to ovulate tomorrow so I thought I would test on my clearblue Advanced opk tonight. Only thing is- I used a brand new reader (i was using the one I used last month with my high OPKs)... the brand new reader showed low fertility which j don’t believe... especially since the little “o” won’t disappear and I have a lot of eggwhite CM... so confused. Makes me want to stop testing for O... anyone ever have this happen. I really feel this was a faulty test and I’ll retest again in AM