uhm to me it looks the same... 0 is OK finished floor, and then the terrain on the left by the street (?) is 49cm higher...
or how else should I interpret the orange line "existing terrain profile"
: You can't interpret your own plan, but you signed it?
The orange line is the terrain, so the floor slab is below the terrain edge. Do you live in the flatlands? Hopefully, you are not the lowest property in the building area?
And you forget that we live on a slope.
1. I even have a neighbor whose ground floor window top edge is at street level, which is unattractive but due to the slope he has no water problems either.
2. You probably wouldn't even notice at first glance that it is like this.