I still don't know why...
It was really surprising for us , when we see it.
Besides EFOB kept increasing while we got close to the destination.
On final approach it was 3.9T, but we landed with 2.8T
But On the return flight everything was normal
I asked some of the captains in the fleet and one of them said he had expereinced it 2 years ago for once. So its like rare and a misterious situation
May be one of the guys in the forum happend to have this as well and have an explanation...