"Tunneling" is a situation where the wax burns straight down the center of the jar, leaving wax on the side. This is not supposed to happen. Since our candles are soy, they behave a little differently than paraffin wax candles. Here is how to prevent tunneling:
Make sure that the wick of the candle is 1/2 inch long. Soy melts at a lower temperature than normal wax, but a big melt pool is important. When first lighting the candle, let it burn long enought o turn the entire top of the candle into liquid. It may take some time. If it does not burn all the way to the edge of the jar, there are no worries, but let it get as big and as close to that as you can. Make sure that you do not burn the candle for longer than three or four hours at a time, in order to avoid drawing all the oils out in the first burn. After that first time, make sure you burn the candles long enough so that a "wax pool" forms every time.
If your candle DOES tunnel, here are some things to try first:
You can always try wrapping the top of the candle in tin foil, leaving an opening at the top, to get the wax on the side to melt while burning. You may have to very carefully remove some of the liquid wax as the candle burns in order to keep the flame from going out in the wax. You can then let the liquid form until it's around 1/4 income deep. This should decrease the chances of it tunneling in the future.
If you are having trouble with getting the wick to light, try trimming it to the appropriate length. Tilt the candle to get the flame "under" the wick, and if any wax is on the wick, gently clean it away, or hold the flame there long enough for it to melt, and then try to light it.