join is not joining everything

 From:  Klingbeil
4605.1 
what am i doing wrong?

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i created a large hex with the polygon tool, then created another smaller one and filled the larger one by copying and pasting it with point to point snapping into a larger group and then copy and pasting that to completely fill the larger hex. i then selected everything and clicked on "join".

however not everything is joining.

any thoughts? i've attached the .3DM file
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