Smart Animation doesnt animate properly

I have created an animation in my project and it worked well when i preview it yesterday, no changes made at all in the file and i tired to run the same project today but the transitions are not working properly - for example a group resized from large to small, usually the transition works smoothly, but now its just show the large layer and fading out to the next frame - in which the same layer is small.
It suppose to look like this:

The weird thing is that it worked properly yesterday and today it doesn’t.
Of course i checked the layer name and hierarchies, it all seems to be ok.

What can be the reason?