Hi,
I've had a look and I can't find this issue having been reported so apologies if it's already been reported.
When you drive into the pits and select a pit strategy on the way in (IE you've drove in and changed from PIT Strat 1 to Pit Strat 2) it doesn't appear to change the strategy. This was tested fairly extensively last night as we had a 70 lap race around willow springs in the stock cars. 3 Pit stops and people had varying fuel levels for each pit stop - however each time it was putting in the fuel amount it should have done on the previous pit stop.
So I pitted for pit 1 and it put in the amount expected as I didn't need to change my strategy, Pit 2 it put in the same amount again when I expected more fuel. Pit 3 it put it the amount of fuel it should have for Pit 2.
I hope this is clear and helps the devs in someway of finding the source of the pitting issues.