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In pic number 2 you see that if there is no washer on the bottom one that is what is keeping it from sealing.
The older models like mine have the hard line ends silver brazed on. The ends on the newer lines look like they were swedged/cold formed and the metal on them needs to be soft in order to squeeze them into shape.
We had a hand powered hard line swedging setup at one place where I worked. It is also possible for the person not to allow enough tubing sticking out so the swedged end becomes malformed.
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84 300D, 82 Volvo 244Gl Diesel
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