MMH5.5 - Heroes of Might and Magic 5.5

kiko, this is a normal situation for RMG maps. It's a protection against "hacking." It's not related to Heroes 5.5!
If you open the map-tag.xdb file of a map using WinRAR + Notepad, there's a special flag there:

false

For random maps, it's:

true

Opening it in the editor changes this flag from true to false, which is the cause of all the problems. However, it's possible that there's another similar flag somewhere else, but this should be enough; please check.