I am having the exact same issue starting this past weekend. Last week I could see lap times for each mile I ran and now it just has one lap with incorrect distance and pace. The issue affects all of my run data, not just the most recent ones.
Best Answer@shipsgirl this looks like a unit conversion problem. For some reason, Fitbit has had problems with it on multiple occasions. It so happens that 1 mile is 1.61km. Looks like a bug in the app. Nothing else to do but wait for a fix.