That's totally normal. An individual study is unlikely to have enough statistical power to make a definite conclusion, and an individual line of evidence is ins

That's totally normal. An individual study is unlikely to have enough statistical power to make a definite conclusion, and an individual line of evidence is insufficient to confirm a theory. No conclusion can be stated with any certainty until it is verified repeatedly, and no theory is fit for use until several consistent lines of evidence conform to its predictions. In fact, even calling these findings "false"is often inaccurate, as most researchers don't make strong claims.