[lch]

As has been stated before by llamabeast and Foodstamp, there seems to be some weird caching system which as a result does not show/generate the new map image (*.rgb/*.tga) in the game if there has already been generated one with the same name. The map file (*.map) with the neighbors and terrain flags, however, does get overwritten/updated, and thus it results in seemingly "wrong" generated maps, where forest provinces are marked as being underwater etc., just because the map image does not belong to the *.map file. I have seen this in some other games I participated in.

In order to make a meaningful bug report: State your operating system and game version (patch number). Describe in detail the steps as to how this bug can be reproduced. Let others check and verify your description. Let the devs fix it.

As a workaround, the previously mentioned "use a different name every time", "delete the generated map in the game before trying again" and "restart the game between generating" might be worth trying out.