Mexico National Census 1930 - Un-Indexed Data

What is the reason or reasons that some pages of the Mexico National Census 1930 have not been indexed or the indexed data is not visible?
I am logged into my account from a FamilySearch center and am specifically viewing records at the following location.
- Mexico National Census, 1930
- Sonora
- Cajeme
- Ciudad Obregón
To list a few pages as examples, here is what I see.
1-6 - Not indexed
7-11 - Indexed
12, 14 - Not indexed
15-16 - Indexed
17 - Not Indexed
18 - Indexed
19 - Not Indexed
20 - Indexed
21-28 - Not Indexed
Thank you for any input you can provide.
Answers
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@Alan Stoddard Sorry that it has been a whole year and your questions were not answered. The Mexico 1930 Census is one of several collections in which much of the indexed data is not visible. Engineers are working to repair the code, but the problem is complex and thus might still take a while to resolve.
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