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No, it's not normal but not the failure of the system software. It can be the issue of that specific battery or a battery calibration issue.
Here's my battery curve with this same exact ROM version but with the original battery:
If your phone is rooted, you can calibrate the battery with the Battery Calibration app. If not, you can recalibrate the battery by flashing your phone with the Format All + Download option when the battery is fully charged. The first boot up after flashing should be processed with fully charged battery to let the system save a correct battery calibration data.
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