Widget animation not animating properly in game

Hi,

I made a simple animation that hides or show buttons when you click on ‘Jouer’ :
First screen on editor :

The animation works fine and we finally get this screen :

In the game I got this start screen:

and the final screen looks like this :

I only use render opacity and visibility options, I verified all the animation and don’t understand why the result is so weird in-game, have you any idea how to resolve it?

Could you show this animation bit:

yes, this is the whole animation:

Well, I decided to abandon this kind of animation, I can’t make it works…
Thank you for your comments…