Some question about the result of deephit_competing_risks

First of all,thank you very much for your work.
I would like to know that the result ev1 and ev2 of the synthesized data in "deephit_competing_risk.ipynb" is 0.3 different from that of the original author(Deephit: A deep learning approach to survival analysis with competing risks. In Thirty-Second AAAI Conference on Artificial Intelligence, 2018). May I ask why this is?
Thank you for your answer.