Have you tried it in a caloric surplus? Because improving strength in a deficit is extremely difficult.
Also, were you on a program that was setup for adding incremental amounts of weight to the bar?
Creatine is not magic and probably won't suddenly add some untold amount of weight to, say, one's bench press. The improvement in ATP will basically allow you to complete that 5th heavy rep of your last set where you otherwise would fail. Over time, that will invariably get more total weight on the bar assuming other factors such as programming and diet are in order, though testing 1 rep maxes is often an imperfect measurement for general population trainees. 1 rep maxes have a strong neurological component that must be ramped up to. 3 and 5 rep maxes are going to provide much more useful feedback for people who are not (competitive) powerlifters.
May well be the fact that your body doesn't respond to creatine -This is about 20% of the population. But, from your description, I'm unsure if I would rule it out quote yet either.
More and more doctors are recommending creatine for people who don't even lift just for the cognitive benefits.