Sometimes delta in time standings is not updated. Times are updated randomly from few seconds to even minute. Sometimes time is refreshing in real time (gap to opponents) sometimes not, restarting game help but not every time. I tested on BMW M2 and Nordschleife on public-beta and 1118 release, AI race - the same result. Do you have that issue? How to resolve this?
Left arrow by default switches between 'live' gaps and sector gaps. ("splits"). If you change your pit menu controls it'll be whatever is assigned to Left.