[Dovecot] maildir quota divergence

Hello;

We are using maildir quotas and have found differences in many users in respect to what system command are showing and doveadm quotas.

For example, four user test, we have:

doveadm quota get -u test Quota name Type Value Limit % STORAGE 98066 102400 95 MESSAGE 883

•                                                    0

But if we check user mail_location with "du" system command we get he is using 70458 Kb.

We are running dovecot 2.1.17

¿any clue?

Thanks in advance.