The FIRST_WEEK_METHOD is influenced by another setting. The setting is part of the UC_CLIENT_SETTINGS. It is the FIRST_DAY_OF_WEEK.
This is how you define the first day of the week. The following options are available:
Default value: "2"
"1" - Sunday
"2" - Monday
"3" - Tuesday
"4" - Wednesday
"5" - Thursday
"6" - Friday
"7" - Saturday
Note the default is 2 which means Monday. If the week starts on Monday then it does actually have 7 days in 2018.
To resolve this follow the directions below:
1. Open UC_CLIENT_SETTINGS
2. Add keyword FIRST_DAY_OF_WEEK with a value of 1
3. Open the calendar and trigger a recalculation. You may need to make some sort of change to trigger this. One option is to create a test keyword and save (it can be deleted after). Once the recalculation is complete you should see the keyword with the first highlighted date on the 2nd week of the year.
Fix Status: No Fix