Weird shadow on bookcase door and opening animation too fast

I'm creating a tileable secret bookcase door based off the GTW bookcase, since the secret doors that came with the base game are not really tileable with any of the bookcases. In S4S the bookcase door I created looks fine:

But in game it has some weird shadows on top unlike the actual bookcases. I've tried changing the shader to Cabinet (which was the original bookshelf shader) instead of Phong (from the door I cloned), but the animation stopped playing and it didn't made any difference since the shadow remained, so I reverted it back to Phong.

Another thing, the opening animation is very fast, while the closing one is at normal speed, even though the opening animation is just the reverse of the closing one. Any idea why it's happening faster than it's supposed to be? Or do doors have a fixed duration for the opening animation?

The package files (main file and animation clip pack) are here.