React Native router flux not getting correct focused value on icon render

### Version
- react-native-router-flux v4.0.1
- react v16.3.1
- react-native v0.55.4

### Expected behaviour
I need to get the focused as true for the selected ones.

### Actual behaviour
Now, when I load my project I would get both 'true' and 'false' from focused value. That, I think it would render 2 times with different values.

This is my code

{
console.log(selected); return (

);
}}
{...DefaultProps.navbarProps}
>

{
console.log(focused); return (

);
}}
{...DefaultProps.navbarProps}
>

{
console.log(selected); return (

);
}}
{...DefaultProps.navbarProps}
>



Result of the code:
true
false
true
false
true
false
true
false
true
false
true
false

When I click on the tabs , this same pattern would reproduce.