Having trouble joining shapes

I’m sure I’m missing something but for some reasons sometime I can easily join shapes and some other time just can’t like in the simple design attached. I Intentionally put the 3 shapes that I want to join in different layer. Thanks for your help.

Spatule ronde.lbrn2 (11.7 KB)

Zooming in reveals that there are gaps between the different shapes.

This is also probably worth reviewing:

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