Problems with lives

In case of winning a map, in the next map, if the host joins later than the other players, he doesn't bring his weapons and lives from the previous level, but starts with the default numbers of lives and with the default weapons of the map. It's a very annoying problem I think, is there a solution?

Another: If I play boss1 with other players, the great boss zombie doesn't appear, we can only see small little colourful "sticks" instead of him in his starting position. If I play alone, there aren't any problems with him.