If at first you don't succeed, try try again. Then if you succeed, try try again. Carry on until you have constructed a body of results you can evaluate as a whole.
There is a reproducibility problem for who have a model of the universe that works like this: If A is true, then investigation will uncover evidence supporting A, and no evidence supporting not-A. If this is your world view, then the instant you have any contradictory data you have a worldview crisis.
It is perfectly normal for science to yield contradictory results. That's why when you see a study reported saying taking Garcina Cambogia yields astonishing weight loss results you don't immediately run out to the health food store to buy miracle pills. It's absolutely routine for results like this not to stand up. The problem is that journalists are too ignorant of how science works to understand this.