You are at #59 according to this
ranking tool for that term
without quotes. The red dot on the screen is your site. This also compares against Google and you are not in the results for that term.
With quotes your are #76 at Yahoo.
Click here.
I ran the two thru Yahoo proper and they were #59 and #71 respectively. The with quotes results were different it appears.
I tried it over at yahoo-watch.org to see what they had. Those were #56 and #75 respectively.
It seems that different parts of the country reveal different result sets, or it may be something else entirely (what I do not know).
As for you being much higher when you checked the results, it may be that you have now lost position from that point in time until now. What are you showing now?