I was trying to reproduce the constants as described at the top here:
https://github.com/iden3/circomlib/blob/master/circuits/poseidon_constants.circom

by running
sage generate_parameters_grain.sage 1 0 254 2 8 56 0x30644e72e131a029b85045b68181585d2833e84879b9709143e1f593f0000001

I see the discrepancy in the result, i.e. the 3rd constant that sage outputs is
0x1e28a1d935698ad1142e51182bb54cf4a00ea5aabd6268bd317ea977cc154a30
whereas in your file it is
0x250f5116a417d76aaa422952fcc5b33329f7714fc26d56c0432507fc740a87c4

Could you pls explain how you obtained those constants? Thanks.