Corner pieces not closing fully

Just getting my rig set up and i noticed a possible issue on the corner pieces. The pics show a few mm gap between the two pieces which ended up cracking a screw port when i was tightening.

If i pull the pipes back past the ridge on the outside and remove the piece that goes between pipes it fits fine. Am i missing something or have wrong pipe?

They are clamps, there has to be a gap. The instructions say to barely tighten them and make sure the gap is even all the way around.

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Thanks for the help. Wasnt super clear from the written instructions or pictures, but i got it now.