"Stuart
"Atom
I think he is meaning that he's altered the fuel and instead it's put in the original amount that was pre-planned before the race.
Common bug, though it's usually because people don't know how to operate it properly (not saying this is the case here.) Most of the users who complain about this problem alter the fuel amounts but don't manually pit the drivers themselves, instead they just wait for the pit light to come on which unfortunately won't work.
Ok if wanted to change the fuel mid race I change the fuel in the next stint box? Problem resolved?
No unfortunately not problem solved. You have to change the amount, then wait for the green PIT light to come on, unselect it and then manually press it yourself. If you just change the quantity and let the driver pit by himself/herself, it will fit the original amount of fuel you had set, not the one you changed it to. It's a silly system but this is how it is.