Parent's view buttons showing after push in NavigationView

I've been experiencing some weird behaviour when pushing a view in a NavigationController in Sencha Touch.

This has happened to me before, once, but I solved it by setting a background colour. This time that won't do it though.

The thing is when I push the view I can still see the buttons from the previous view all over my new view. This happens both on simulator and device (iOS 7.1 and 8 is what I tested so far)

For example...

When I press "Trazar" in this view...



it shows this view...



But as you can see the buttons from my first view are still visible.

Here's the button's handler...

Code:

{    xtype:'button',    text:'Trazar',    width:150,    ui:'action-round',    handler:function(btn){        var buslist = Ext.create('ibus.view.BusList');        btn.up('buslist').push(buslist);}

And here's what BusList looks like...

Code:

Ext.define('ibus.view.BusList',{    extend:'Ext.Panel',    initialize:function(){        console.log(this)    },    config:{        title:'Lineas',        style:'background-color:#EEEEEE',        layout: 'fit',        title:'Lineas',        items: [{        }]    }})

I removed all items from the view to try and spot where the issue might be coming from, but I still get the same result with a pretty much empty view and I cannot for the life of me figure out where I'm failing.

Any help on this will be greatly appreciated.



Parent's view buttons showing after push in NavigationView