Yes, it's all normal, is the effect of a textures which was originally at 4096x4096 resolution in FSX, and was resized to 1024x1024 in FS9.
To keep the same visual resolution, adapted for the 1024x1024 which is the maximum FS9 allows, would have taken too much time, because we would had to remodel *every* parking stand sign, one by one, to fit with a new texture. We did it in some cases, the photoreal background and the service vehicles have been remade, but we haven't done it everywhere.