Please check ISO 8601 - https://en.wikipedia.org/wiki/ISO_8601#Week_dates :
There are several mutually equivalent and compatible descriptions of week 01:
- the week with the year's first Thursday in it (the formal ISO definition),
- the week with 4 January in it,
- the first week with the majority (four or more) of its days in the starting year, and
- the week starting with the Monday in the period 29 December – 4 January.
So the week numbers in 2021 will always be wrong. Week 7 is shown as week 8 in the app et cetera. This is a design flaw in the app.
Will this be fixed?