Comment (by Ken Hui):

(Updates)
Okay, it turns out that if I amend some of the parameters in Lorene/C++/Include/unites.h in LORENE2 according to those in LORENE1, I can reproduce the nsnstohmns simulation.

But I would still like to know if there is a way to understand how it causes the error in Carpet, and how it can be fixed. Thank you.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2599/nsnstohmns-cannot-be-reproduced-using