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When I join 3 objects together they mash up in a wierd way. Instead of joining together, they all go to the same z-coordinate.
I guess you are joining bezier curve, and the last you select before your ctrl J is in 2D (check it out in the Properties panel > Data > Shape > 2D or 3D). So either switch it to 3D or don't select this 2D object at last before your ctrl J.
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