My 3.4.5 has ~ 35000 jpg masters.  I have set aperture not to create previews on import and have ensured "maintain previews" is not ticked.  Every time I start aperture it insists on creating previews for ~ 4300 images. Why?

Having had the previews created I selected all photos and "delete previews".  It did this quickly and no more previews being created.  Once aperture is closed and then re-opened aperture immediately sets about creating the previews for the same photos.  I don't understand why this should be happening.
This is occuring on my Mackbook Air (Aug 2012) which has 256 GB storage. I am fast running out of space as I am using "Managed Masters".  I intend to make the masters referenced by relocating them to an external HDD but before doing this would like to clear up this problem first. I keep my Vault on the external HDD and have Time Machine and Time Capsule.  When I have relocated the masters to the external HDD I intend that TM backs the external HDD to the TC.  I tink that I will use the second partition on the external HDD for Carbon Copy Cloner to back up the Mackbook Air.
Any help or advice warmly welcomed.

Frank
Many thanks for your input.
Following your advice I have selected all the projects individually and checked the status of Mantain Previews.  Some were indeed marked up for Mantail Preview so I have unmarked them.
I have also selected Photos and deleted  previews and also repeated this for My Projects.
Checking the Get Info for the Preview folder in Aperture Library in Finder this now tells me that I have zero bytes for 564 items.
Close and then reopen Aperture and it regenerates these564 previews in the blink of an eye.  I haven't been able to locate these photos yet.  I know there are about 120 in facebook and 10 in photostream but dont know where the rest are.
It seems the issue is not with Aperture but with myself and not understanding Aperture sufficiently well
Do you see the problem this way?

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