Some visual issues seem to have been plagueing the live race viewer over the last week. Other people in my league (Victorious Secret) have also confirmed that this is happening to them.
It seems that the race itself isn't affected in terms of pace, however about half way into races the timesheet becomes glitchy - showing multiple versions of one driver and incorrect position numbers, and the 'swap driver' selection doesn't select my drivers. This only seems to be in the middle part of the race. As far as I can tell the time sheet is correct at the start and end of the race.
Other glitches are with some DRS and boost icons continuing to appear next to cars after being used.
I have been using the app on iPhone. Not sure about others in the league yet, but I'll ask them to add any info they can to this post.