Apparently they have no solid theory on why this is occuring:

How this neutron star is able to suck its meal in so fast is a mystery. Possible explanations, that Bachetti and the team discuss in their paper, include the pulsar’s strong magnetic field, which could “change the interaction between the radiation and the infalling matter, permitting higher accretion rates,” Bachetti wrote.

Whatever the explanation, this bizarre and game-changing discovery will keep scientists scratching their heads for a while.

“The original theory that put this limit on how bright these things should be is about 100 times fainter than this object,” said a research fellow in the department of physics at University of Alberta in Canada Jeanette C. Gladstone, who wasn’t involved in the research, in a Nature podcast.

Indeed, astrophysicists will have to change their models to explain this unique observation.  What do you think?  Feel free to comment.

thanks to businessinsider.com for the great info

thanks to caltech.edu for the pis