I found the osmand maps quite out of date. Maybe the POI are added after the offline map was created. Just a guess. In my area I created my own offline map. The tool run on 2 GB heap memory and took about 20 hours to calculate. osmand maps are not up-to-date even if osmand shows you it is up-to-date. This up-to-date just means that osmand doesn’t offer any more recent maps. But for sure OSM has more recent maps.
I think it must be something different - some of the POIs that are mentioned are from January 2009, it seems unlikely Osmand would use map material that would be THAT old.