I wouldn't call it backfiring necessarily, if you're making a request, generally there must be some form of repayment (payment) for the request. Take an overall look at your request, was it fulfilled in the end? If so then the negative consequences may be part of the repayment. If the request never happened and just fell apart, then I would suggest the spell or request was not done right, or what you are asking goes against the will of nature.
I believe that this is tied into nature and the flow and connection to the earth and her elements, however it really depends on your beliefs and whom you honor and request favors to.
Hope this helps!