Action Launcher automatically switches to Nova Launcher when I press the home (middle) Button?

[HappyKiddo]

So I set a theme called (Car theme), which is applicable to many launchers (Nova, Action, Ex,Go,Aviate, etc...).. I I set the "Car theme" and choose Action Launcher and then it works,with Action Launcher currently running the theme. But when I press the home button, my phone automatically switches to NOVA LAUNCHER, why does that happen?

I only have Action Launcher and Nova Launcher installed btw.

More Info: My Nova launcher has 2 boxes :
1. Red=Import from another Launcher - When I press it this message shows "no supported launchers to import from"
2. BLUE = Restore Previous Nova backup - When I press it this message shows "no back ups in this location for both SD CARD AND DEVICE STORAGE."

Please help anyone, and thoughts on this?

 

[Crashdamage]

Have you gone to Settings > Apps > Nova Launcher > Clear defaults?

 

[HappyKiddo]

Haha It works!!! Thanks buddy! Im sorry if what I asked seemed like a stupid question lol, but thank you very much dude!

Anyway if you dont mind, what launcher are you using right now? and why?

 

[Crashdamage]

Using Nova on all of our devices. The free version does everything we need.

 

[HappyKiddo]

I see. Thanks for replying I really appreciate it =)