This question was inspired by PlayboyMommy, actually, who was asking why her stitches would get longer and more spaced out as she knitted along. It turned out that was a matter of changing her cast-on to long-tail.
The thing is, I do cast on with long tail and my stitches continue to do this stretching, increasing space between stitches thing. I do get the right number of stitches, but somehow when I'm knitting continental, it just stretches and spaces. I don't know what the hell I'm doing wrong