This issue may occur, for example, at the turn of the year. The API (web interface) stores information about the accounting period in cache (temporary buffer memory). At the turn of the year, it may happen that the API still holds a value from the end of the previous year, even though changes in the data have already occurred at the beginning of the new year.
The cache will not be cleared until the user is logged out. At the beginning of a new period, it is recommended to log the user out and back in.
In the case of the web interface, it is sufficient to log the user out directly from the User Profile in the top right corner.
In the case of the API, please follow the documentation for logging out users in the REST API.