Since both you and @JJD were having problems (see this thread)
and one of my relatives told me last night my listing disappeared if they filtered for Air Conditioning but I could not reproduce the glitch, I went and played around a bit on the site. It looks like the problem is just choosing too many filters; it does not seem to matter which ones you choose.
Once I choose about nine-ten filters (and get down to three-five listings) my listing disappears even though I know I am good for all of them. I can remove some at random (doesn’t have to be the same ones each time) and my listing will pop back up once I get it around six-eight filters total. Could you check and see if this is true for you also?