The panel is empty
Weather, wind and tide are based on each location's position. If a location has no address or coordinates, there is nothing to look up. Add or correct the address under Settings > Locations.
There is weather but no tide
Tide only applies to coastal locations. Inland sites show weather and wind with no tide, which is expected behaviour.
The numbers look off
Conditions are refreshed regularly rather than every second, so a value can be a little behind a sudden change. If a location's data looks consistently wrong, check the address is in the right place on the map under Settings > Locations.