UI INPUT is not fluid

[diuzzoli]

Hi all, I have the following scheme:

uf.attachSchema(new SimpleSchema({
    codigo: {
        type: String,
        label: "Código"
    },
    unidad: {
        type: String,
        label: "Unidad"
    },
    propietarios: {
        type: Array,
        optional: true
    },
    'propietarios.$':{
        type: Object
    },
    'propietarios.$.nombre':{
        type: String
    },
    'propietarios.$.mail':{
        type: String,
        regEx: SimpleSchema.RegEx.Email
    }
}));

The problem is that the group of PROPIETARIOS does not 100% of the screen. How I can fix or change this class?

This is how it shows:

This is how it should show:

In the HTML template I use:

        <div class="ui container">
            {{#autoForm collection="uf" id="UfPropietariosForm" doc=uf type="update" template="semanticUI" fields="propietarios"}}
                {{> afQuickFields}}
                <div class="ui right aligned container">
                    <div class="actions">
                        <button type="submit" class="ui blue submit button">Confirmar</button>
                        <button type="button" class="ui cancel button">Cancelar</button>
                    </div>
                </div>
            {{/autoForm}}
        </div>

Regards Daniel