GridLayout shared element transition not working correctly

I'm trying to create a transition between a RecyclerView with a GridLayoutManager and a fragment. The grid shows user pictures thumbnails and when i tap the thumbnail it shows the details of the user. However, when i tap the thumbnail and show the details, the transition always starts from the top left of the screen instead of the thumbnail position.

How can i make the transition start from the thumbnail position?

This is the result i want:

And this is what i got:

And this is my code:

// UsersAdapter.kt
override fun onBindViewHolder(holder: UserViewHolder, position: Int) {
        ViewCompat.setTransitionName(holder.itemView.picture, "picture_$position")
}

// MasterFragment.kt
// This is called when i click an item in the grid
itemClickSubject.subscribe { position ->
        val user = users[position]
        val transitionName = "picture_$position"

        fragmentManager
                ?.beginTransaction()
                ?.addSharedElement(picture, transitionName)
                ?.replace(R.id.content, DetailsFragment.create(user, transitionName))
                ?.addToBackStack(null)
                ?.commit()
    }.addTo(disposables)

// DetailsFragment.kt
class DetailsFragment : Fragment() {

    companion object {

        fun create(user: User, transitionName: String): DetailsFragment {
            val args = Bundle()
            args.putParcelable("user", user)
            args.putString("transition_name", transitionName)

            val fragment = DetailsFragment()
            fragment.arguments = args

            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {                   
                fragment.sharedElementEnterTransition = ChangeBounds()
                fragment.sharedElementReturnTransition = ChangeBounds()
            }

            return fragment
        }

    }

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
        return inflater.inflate(R.layout.fragment_details, container, false).apply {
            val transitionName = arguments?.getString("transition_name", "")
            ViewCompat.setTransitionName(findViewById(R.id.picture), transitionName)
        }
    }

}