Multiple Pit Stops

I'm struggling to work out how to get my car to stop in my pit box. Can anyone help?

I tried to run a Daytona 24hrs and set up a pit strategy before the race. The race was 1 hr with 20x time progression. I thought I'd probably need to stop 3 times for tyres and set my strategy for tyres to be changed and 16 laps of fuel. I saved and activated the strategy.

After 15 laps I pitted and the stop worked fine. I requested my next stop around the 30 lap mark and my car drove straight through the pits without stopping. I tried again with the same outcome so i started playing with the Car Management options. I altered the strategy a bit to include aero fixes since I crashed while navigating the menu and requested another stop. Again my car just drove straight through the pits.

Do I need to set a strategy for each stop or do something extra to what I'm already doing?

Then to annoy me even further in the final race classification my Group C car was shown in the GTO class.
 
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