page title is not the same under different keywords?

I made back links for one of my category page url under 2 or 3 anchor keywords. both the keywords ranked, but in an odd way, with different keywords this page also ranked different title.i don't know why. the page url and cache is exactly the same,how could one page has two titles under different keywords?

I am also having this problem. One keyword is slightly different then another and the same page is ranking but bringing up different title tags. I would like to know how to fix this as well