"A reproducibility crisis is a situation where many scientific studies cannot be reproduced. Inappropriate practices of science, such as HARKing, p-hacking, and selective reporting of positive results, have been suggested as causes of irreproducibility. " Also, lack of raw data or data fabrication is another possible cause of irreproducibility. Here is a paper named "No raw data, no science: another possible source of the reproducibility crisis", which helps us to realize that lack of raw data or data fabrication is another possible cause of irreproducibility. (https://link.springer.com/article/10.1186/s13041-020-0552-2)

"Is there a reproducibility crisis in science? Many seem to believe so. In a survey by the journal Nature, around 90% of respondents agreed that there is a “slight” or “significant” crisis, and between 40% and 70% agreed that selective reporting, fraud, and pressures to publish “always” or “often” contribute to irreproducible research." I think this paper is paper is very useful and interesting. And the link is attached below: https://www.pnas.org/content/115/11/2628.short