Another aspect to Updates on January 10, 2022 (Release 463) is that lots of your interactions with the map will now persist as you move around the overall CityStrides website.
One major benefit of this is being able to build a route while visiting one of your activities, then moving to a street that it progressed, then moving to the city it exists in - all without losing any of the route you’re building.
So what you probably did was toggle your LifeMap to display, then browse around the site, and it stayed toggled on the whole time. When you returned in a fresh session, its defaults kicked in (off).
That said, I’ve got a fix that’ll go in the next release to automatically show your LifeMap on city pages (and hide it when you transition away e.g. to a street page).