My Laptop's battery jumps from 100% to 93% even its plugged in and charging

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EyadAhmed_182111

I always power on my laptop while its battery is 100% and plugged in too.so, after using my laptop for about 2 hours suddenly its battery jumps from 100% to 93% Even it was 100% and plugged in and the AC Adapter is correctly plugged in. why?I ran a power troubleshooter a lot of times but still the same.it just set my brightness to low.and I think it's a windows problem.because when it jumps to 93% and starts to charge again to 100%, the laptop's battery lamp is off which means the battery is fully charged and not charging.

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