Fixes runs that were counted as much longer than they were. When more than one app on your phone records your runs, like Samsung Health plus a watch or running app, RunTeaming was adding their distances together, so a 10-mile run could count as 20 or 30. It now uses one app's distance, once. A run recorded by two apps also counts as one run, not two.
Your last 30 days of runs are corrected the next time you open the app.