If you are changing an Employee's preferences and they do not seem to be
displaying correctly check that the dates do not have any DATE SPECIFIC
preferences added. DATE SPECIFIC preference always override the REPEATING preferences.
On the Employee Details>Schedules tab you will see the date background
shaded on days that have
DATE SPECIFIC preference overriding the REPEATING type of preferences .
(See circled date below). In this example May 23rd has been set as
different than repeating and is set to prefer all day, so matter how the
REPEATING WEEKLY are set that will be overridden.

To change a date specific preference click the shaded date or click
the Set DATE SPECIFIC PREFERENCES button in the bottom left.
Normally
Employees enter their own work time preferences (which can
be used when you AutoFill) but if Managers edit the preferences for an Employee they need to be aware that:
- REPEATING WEEKLY preferences should be added first
- then any DATE SPECIFIC preferences can be added if a particular
date is different