Batch Process does not list all models (CE U17.1)

Hello, I'm trying to run a little batch process on the files in my drawing (which I've done on drawings in the past without issue) but this time when I try to run the file only some of the models are listed in the models to processed, see below.

Does anyone have any ideas as to why the rest of the models aren't showing up in this list? 

Just an FYI, in V8i SS10 all of the models show up in the list.