Issue with timeline : gameobject's transform changed

Hello,

I guess it's a silly one. But : i 'm trying to animate an object ( for example a door ) with timeline. So i set my animations and it works fine in the preview mode. But then, in the game mode, my door has disappeared ( its transform is set to a weird position), until the animation is launched. Then the doors appears and open. Of course, i would that door is present in the gameview before it' s open. Thanks for the advices !