Question Animation Problem/Question

Hello everyone.
I have a strange animation error in my app.
As you can see at the gif i posted on the bottom of this post at around 5 second mark the hidden game object appears for a split second and then the animation starts.

I feel quite sure that i don't have an error at my animation windows as its a quite simple animation thats brings the panel from the top of the screen to the center.

I also tried to make the panel invisible for the first seconds in case this fixed the issue but it didn't worked.
Anyone had an error like this before?
Any ideas?

Every other animation i have with exactly the same way created is working like a charm. No idea why this is happening here

 

Bump if anyone has any idea