That may be as a result of oil, dirt, or wet on fingers/scanner surface. Some may due to wear too, the ridges and valleys may no longer be as prominent as they used to, giving the scanner a harder time to make a match. I will check your post now.
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Haha oil or dirt😋😂
Yeah, they are the usual suspect when this happens. It somehow makes it hard for the scanner to get a good digital image of the fingerprint. A dry clean hand works best. Other times it may just be the fingers have worn so much with use/age that it is not as it was before.