Grid doesn't understand totalProperty

Hello there! How are you guys?

I'm using EXT 4.2 and it's MVC architecture.

I have a View with a grid which is populated by a Store using a JSON proxy. This grid does have a "pagingToolbar" docked at it's top. I have "pageSize" defined to "25" on my grid, and "limit" and "pageSize" also defined to "25" on my Store. Somehow, the grid don't recognize the "totalProperty" value from my reader. I can confirm that JSON's values are correct through Firebug, but my grid's "displayMsg" keep displaying "1 - 25 from 25", when my JSON returns "1880" as it's "total" value. As a result of this problem, I'm not able to navigate through pages...

Do you guys have any ideia on what's going on? I'll post some codes below.

Store:

Code:

Ext.define('MyApp.store.Empresas', {
    extend: 'Ext.data.Store',

    model: 'MyApp.model.Empresas',
    start: 0,
    limit: 25,
    pageSize: 25,
    autoLoad: true,
    
    proxy: {
        type: 'ajax',
        api: {     
            read: 'resources/data/empresas/ajx_lista_empresas.php',
            update: 'resources/data/empresas/ajx_update_empresas.php',
            create: 'resources/data/empresas/ajx_create_empresas.php',
            destroy: 'resources/data/empresas/ajx_destroy_empresas.php'
        },
        reader: {
            type: 'json',
            root: 'data',
            successProperty: 'success',
            totalProperty: 'total'
        },
        //writer: {
        //    type: 'json',
        //    root: 'data',
        //    encode: true
        //}
    }
});

pagingToolbar definition:

Code:

{
  dock: 'top',
  xtype: 'pagingtoolbar',
  store: 'Empresas',
  pageSize: 25,
  displayInfo: true,
  displayMsg: 'Registros {0} - {1} de {2}',
  emptyMsg: 'Sem Registros'
}

Firebug's JSON ;

firebug.jpg

(I had to hide somethings because this is real data, but you can see the "total" value).