There are currently four versions - UK, Belgium, Sweden and Global.
The Global version does not receive updates from the main OpenStreetMap database. A new copy of the OpenStreetMap database will be imported in occasionally, but this may be a few months out of date.
There are also UK, Belgium and Sweden versions that are updated live from OpenStreetMap, so they should only be around three minutes out of date, although this can rise to being a few hours out of date on busy days. You may need to restart your browser to see the changes, is it may cache the old images.
Because the UK, Belgium and Sweden versions are updated live, you can make changes to the map in OpenStreetMap (use the Edit tab) and then see your changes appear in OpenOrienteeringMap.