Your calculator is not counting correctly! Check x = f196d3200d66872e9573cab8117b3943f482fc2d4ac53be85b34ffad9e8d640c
y = 6bd66e5ca7201d9d22717b1b70719955ca94e864bcedaba2c28d3d0083b5c167
I multiply by scalar 7fffffffffffffffffffffffffffffff5d576e7357a4501ddfe92f46681b20a0
And I cry x = 811cfaa321171426ac4fc20a3a43f8ab4e9579923fafab4630039d7bb4daa263
y = 8081737913496fa1bb67fb4857a8cecbc9e70a56da7d1c588ec1fc7467f2e6eb
This is the wrong result. Should be x = 811cfaa321171426ac4fc20a3a43f8ab4e9579923fafab4630039d7bb4daa263
y = 7f7e8c86ecb6905e449804b7a85731343618f5a92582e3a7713e038a980d1544