Preventing duplicate ui-view in AngularJS

Question

The situation

I have a ui-view component in my template:

<div id="innerController" ui-view="stateview"></div>

And I have states A and B defined for this view.

The problem

When I go from state A->B, the rendered DOM looks like this:

And I got 2 different states on the screen.

The question

Why do I get 2 different ui-views?

How can I force a single ui-view?

Thanks!