I've seen that before. It's from making the flare skirt too thin, (too much muscle),
or it's from over-tightening the nut, Causing the compression nut ring/hole
to squeeze the copper flare thin.
The only other thing that I can think of, is the flare angle.
I was told these flares are different than the standard US flare of 45 degs.
I think they are 37.5 degs or something like that.
The tech guy also told me that he used the 45 flare kit and never had a problem.
Said the nut pulled the fare skirt down into a good seal, when installed.
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