Need Help about MM Security Patches

Good Evening! I opened this thread to ask if someone could give me an hopinion about a problem I had on mu Nexus 6 after going back to MM from Android N preview. So today I unenrolled my device and I received a Marshmallow OTA, which was said to be the last one available. But as soon as I updated my Nexus, I saw they sent me the OTA with July's Security patch. I tried to wait and see if september's update would show up but nothing in 2 days. Is it normal and have I just to wait or is it a problem? Have you had same experiences?
P.S. I wiped data and everything soon after updating back to MM.

from xda-developers http://ift.tt/2cjFQ1B
via IFTTT