This happened because orders to cancel pitstops were being cleared as your car crosses the finish line. I implemented this \"feature\" a while ago to stop any order to cancel a pitstop from affecting more than just the following stop. But in your case, your drivers had decided to pit to change to wet tyres before the finish line. You then disabled \"Follow weather strategy\" before the cars reached the finish line, and crucially you also cancelled the pit stops before the cars reached the finish line. Your order was then nullified as they crossed the finish line and so they both pitted anyway as they originally intended.
I\'ve fixed this so the \"clear\" operation happens immediately after your car passes the pit lane entrance instead.
Btw,
please could you list relevant data in your bug reports, it took me a while to figure out that these were the cars involved:
http://igpmanager.com/play/?url=race-result/7/1403
http://igpmanager.com/play/?url=race-result/7/1885
Thanks