Do you mean the gap with what looks like a ladder? Those ladders are common. Don't stretch the stitches out too far apart and try to keep the needles close so the stitches don't stretch out there. Always start with a knit stitch on the new needle if possible and pull it tight, but not so tight you stretch the yarn out.
When I use DPN I actually wrap my little finger over the joins I'm not knitting. It's hard to explain, but it just happened naturally the way I hold them. I can try to get a picture.
Mostly it just takes practice to learn to use them so keep at it.