Incorrect measure total combining two different tables

Hello everybody, I´m having the following issue: I create a measure that bring either the actual budget execution or my budget to complete.... as I show next:

Table 'contabilidad Balance_Prueba' is the actual execution

Table Presupuesto is the budget

tables 'Ajustes EEFF' and 'Ajustes Forecast' are managerial adjustments.

However, when I display then on a table look what it happen:

I have actual from Jan to Aug... and forecast from Sept to dec..... if you take a closer look you will see that the total amount is not the sum of the 12 months.....

Any thoughts? 

I would really apreciate any help.