Flipbook Sprites not rendering correctly?

I was using some flipbooks animations as a character that moves through the world. (I’m using the MaskedlitSpriteMaterial).

The flipbook looks without a problem when normal.

But the moment it shows an animated one it looks like this:

305874-2.png

It doesn’t look like that nor in the Asset Window (the one with the timeline) or in the Sprite Window.
I tried changing the sprite material and it looks the same.
Even when I builded it it looked like that. Do someone know what’s the problem here?