Actually your plant looks pretty good. They often do grow a long stem/branch like that which is why it is a good idea to trim it back and put the cuttings in the same container so that the pot/basket looks fuller. Just makes sure that you let the area (end) that you cut dry out first before planting it in the soil (otherwise it could rot). This particular epi (Queen of the Night) does grow like a climber. It seems happy in it's location so I think you are doing a good job of growing it.
