The majority of these “studies” are fake. Scientist trying to replicate them cannot and those that they can replicate for the most part do not achieve the same results.
Wrote a program to generate fake data after a college class lab went bad, and that was in the 70s. Because trying to redo the lab would have seriously cut into beer time. I suspect the same motivation applies today.
There is no reward mechanism for professors and students in the universities for replicating and verifying past research work. This article demonstrates that.