There is no error.
The plugin expects that when you pick a date, you will pick the time before moving to the other date and pick the other time.
But if you decide to go back to change the time, you can click on the date, which will unselect it and then click on it again to select and then change the time.
It works as expected. Maybe not the most intuitive.
Then again if i were you i will use two pickers for selecting the range if i care about time.
The picker’s range selection is more suitable for picking dates when you don’t care about time.
If you care about time, i think its more will be more intuitive to use two different pickers, start and end.