It's a BGT game with BGTGO1.8 (not EE).
There sadly are more tile errors in the city Baldurs Gate at night in this version.
Suppose it has something to do with the fact, that there for example is one additional tile at the bottom of the night .TIS in that area in my game (so the whole tileset has new coordinates), while pre-2.0 EE and normal BG don't have it, as shown in the picture (this of course is only wild speculation).
Really hope this somehow can be fixed. :/