Hi there.
So, tools are saying one thing, but actually googling gives you another? I'd look into cache and history related stuff in your browser. Also it might be location biased.
Go into incognito mode, try do a search. See what comes up. Also, tool you are using might have cached information - try couple different tools, see what results you get there. Sometimes it also can be localized bug, and it shows in browser that keyword is not ranking at all, but it actually is. Try from different computers, different browsers. And just wait couple days - see if it comes back up.
P.S. Have you done any black/grey hat recently? 