Since I had a different balance problem using the windows version (mmex-1.4.0-ALPHA-1.1141) and the android version (2017.06.30.957) of MMEx with the same database (shared with dropbox), I Discovered that now for a transfer between accounts, the "status" has been modified: there is a status for the debit account and another one for the credit account.
It seems that the Android version of MMEx does not support this and ignores the transfer transactions created with the new Windows version, therefore the balance is false.