Thanks for your answer.
I've loaded some other scenarios in the editor - and the result is partially similar: In the Scenario "Australia Federation", the book shows a message "40 of 25 Years are elapsed"
In "British Isles": "Jahr (Year): 1870. Sie spielen seit 40 Jahre (You're playing since 40 years). Sie haben Zeit bis Ende 1854 (You've time to end the scenario in 1854) ... "
Very funny is the message in the scenario "Südliches Afrika" (South Africa): Sometimes, the message is: "-80 von 35 Jahren sind vorbei (-80 from 35 years have passed)", sometimes the message is "-25 von 35 Jahren sind vorbei (-25 from 35 years have passed)".
It seems that the "errors" appears because the scenarios were translate in another languages. If this means, that other things go wrong while playing this scenarios I don't know.
I have only a flat map of Corsica and now I regret that I've worked sumultaneously between creating map and programming the scenario.
Now I've seen, that other scenarios obviously have the same "errors", but aparently without any consequences for the game, I will try to make the scenario, based on the old map, one more time. But now, I will save the game more often than before.