TextMesh Pro Broken fonts when animating

Unity: 2018.4.13f1
TexMeshPro: 1.4.1 (from package manager)

It's something super weird but it happened twice in two different projects.
I have this Popup with TextMesh pro components and when I animate the popup programmatically (moving the transform for example) everything works fine but when I want to animate it with the animation legacy or animator it happens what you can see in the picture.

The animation is touching the scale of a container, inside of it its the popup body with texts.

I've used the default settings when creating my font but also happens with the default TextMeshPro font.

Thanks!