Battery saver limits maximum screen brightness in Windows 10. The flyout shows the absolute screen brightness, not an amount relative to the amount limited by battery saver. This is not in line with how Windows displays it in the old popup/action center.
In other words - screen brightness goes from 0-100. Battery saver turns on, screen brightness goes from 0-70. Windows displays this brightness of 70 as 70/70*100 = 100, while the new flyout displays and caps to 70.
Could this be made consistent with the Windows behavior? The maximum brightness may be gettable from https://docs.microsoft.com/en-us/windows/win32/api/highlevelmonitorconfigurationapi/nf-highlevelmonitorconfigurationapi-getmonitorbrightness
Before battery saver (working as expected)

After battery saver + limiting brightness (windows is relative, modern flyouts is absolute)

AHH that's a nice catch.
Thanks for reporting this mate!
We can easily do this just have to change the max value of the slider to the max value of the brightness (which could be fetched through WMI)
But I hard coded the values to be in range of 0 - 100.
I will improve the brightness flyout in v0.9
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Before battery saver (working as expected)

After battery saver + limiting brightness (windows is relative, modern flyouts is absolute)
