While I was writing my answer (see below), I started to think about something. Apparently, several of these objects share the same uuid under “jbb_skatter”. I used the Eneroth extension to look that up. Is that something your extension did, or is it possibly a bug in Sketchup? The objects were created using the ‘make unique’ command and then altered.
Edit: just tried it again; the uuid’s are added when the objects are selected as scatter objects. So I guess that this is a bug in the Skatter extension?
I have recreated the situation in a new file and I see something similar.
Of 4 scatter objects, 2 share their properties. If I change one, the other is also changed.
And, only 1 of these 2 objects is in the scatter. So I only see a distribution of 3 objects instead of 4.
The first file also had 4 objects. In that case all of them were sharing their properties and only 1 was in the scatter.