Comparison of FLUKA and MCNP evaluation results for disk sources?

Dear Experts,
I want to evaluate the difference between FLUKA and MCNP in the disk source counting results for CO-60.But the results varied widely, I want to consult an expert how to return a responsibility?
Thank you in advance,

The MCNP program computes the model:

hpge.flair (872 Bytes)
hpge.inp (1.1 KB)
hpge_17_tab.lis (45.1 KB)

Disk source design in MCNP:
屏幕截图 2022-03-14 000535

I think this is due to the result of MCNP according to the weight of 50%, FLIKA’s result is reliable. In my opinion the problem should have been solved