Ember data (emberfire) save() Record creates duplicate records in store?

I have a form with 2 models in it: here are the models :

model: function(params){
    return Ember.RSVP.hash({
        customer: this.store.findRecord('customer', params.customer_id),
        address: this.store.createRecord('address'),
        parameter: this.store.findRecord('parameter',1),
        newAddress : 'true'
    });
},

When i save these models it creates dulicate records in the store ? Here is may save code :

 createAddress: function(model){
         this.controller.set('model.address.id_customer_fb', parseInt(this.controller.get('model.customer.id')));
         this.controller.set('model.address.id_customer', parseInt(this.controller.get('model.customer.id_customer')));
         this.controller.set('model.address.id', this.controller.get('model.parameter.id_last_address')+1);
         model.address.save()
             .then(()=>{
                 this.controller.set('model.parameter.id_last_address', this.controller.get('model.address.id'));
                 model.parameter.save()
                     .then(()=>{
                         this.toast.info('Nieuw Adres werd toegevoegd !');
                         this.transitionTo('customers.customer');
                     })
                     .catch((error)=>{console.log(error);
                     });
            })
            .catch((error)=>{console.log(error);
        });
    }

Am i doing something wrong or is there a bug (like mentioned in some posts) in Ember data ?