Scorpions are one of the most universally negative symbols and candle reading. They indicate betrayal, doublecrossing, infidelity, and underhandedness or manipulation.
A double scorpion indicates that there are two people who are betraying the target or the worker.
If the two scorpions are in the same area of the candle in the two traitors are likely working together. If they are in different areas of the candle, such as opposite sides, then the target or the worker is being betrayed by different people in different ways. However, the betrayals will always relate back to something to do with the work that is being done.