It looks like that the bigger planetary gears do not roll on the sun gear.

This results from minimization of number of image frames for animation.

When you first time design and manufacture a dual planetary gearing,

you will probably find it cannot be assembled as you are trying to put gears into its housing repeatedly.

And you may say "I don't know why. I selected numbers of teeth correctly."

This mechanism can be assembled when center line of the smaller planetary gear tooth

and that of the bigger one's gear tooth are lined up.

For lining up, information on marking line for manufacturing needs to be written on your drawing.

The marking line is also used for  assembling.