Why does my adjustment not cover a full calendar month?

Each delivery point (PDL) has a different, fixed meter reading date (TDR):

For some customers, it is the 13th of the month, for others the 21st, etc.

It is on this date that Enedis (the network operator) sends us your meter readings and consumption data, which always cover the period between your meter reading date in month M and the same date in month M-1.
Example:

If your TDR is on the 22nd, the consumption transmitted by Enedis will cover the period:
from the 22nd of the previous month to the 22nd of the current month and not from the 1st to the 30th/31st.

This depends on the meter reading schedule defined by Enedis, which is specific to each PDL.