If you are working with the templates you unpacked from the Essentials
exe file, what you are describing must be intentionial; although it
sounds bizarre.
Unless the variations are preventing you from proceeding, just keep
going. I would appreciate it if you documented the surprises. I
suggest a combination of one liners, or some coded marker, or a list
of affected page numbers, augmented by a few of the most unexpected
images. I will ask Graphisoft about it.
I would also be interested in hearing from anybody else who has found
similar or other odd things that I should report to Graphisoft. I have
found they are very appreciative of feedback and will respond if
needed.
Paul