Repeating Group - WIDTH

I am doing a bubble course at UDEMY, and I am struggling with a design with repeating group.
Does anyone know the difference between this two draws? I can´t find the solution why my preview is very different from the course.
The width of the squares are differents but it was set without an specific width, just with a minimum of 320px.

My design.

Course Design:

Thank you.


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