This case occurs when the first day of the year is Thursday (in the common years), or Wednesday or Thursday (in leap years). So, the watch must be capable to show every situation.
The only adjustment is to add, with the corrector, one week at the end of the last week of the year with 52 weeks (like this year).
You're right, the numbers in red are the week number! No ignorance here, thanks for looking
massi