Shadow doesn't adjust on resized objects

greetings !

Now i discovered on an old plot of mine, that a picture has " shadow problems ", which where NOT there i played it 1-2 years ago.

It's a special picture a Sim can make out of a Fossil sample ... looks like stones in a stream (brown colored and square).       It is larger than the original and the "little" shadow is shown lower on the wall.

I always had to think about something a had read about an update : they change something with the representation of the shadows ... maybe it has to do with it ...