Sorry. Ignore.

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I found the stupid mistake. It might be fun to guess what it was....
If not, please give this a pass. I tried to delete just too late.

For the past 18 months or so I've been building a set of related websites sharing their /concrete and /packages folders. I've posted the basics at
https://www.concrete5.org/community/forums/customizing_c5/multiple-s...

I made two changes since then: I switched development to another server and upgraded to 8.3.2.
The change in servers did allow me to insert symlinks into the folders rather than relying on the index.php file.

Today, I noticed that content entered on one site was appearing on all. This has not been an issue before.

All database.php files are set up as they were, pointing to their individual databases. /application directories are kept separate.

Of course I'm at a juncture with the development: Leadership is now committed to the project and starting to take an interest in seeing it done soon.

Why now?
What now?

Any clues? (I will accept told-you-so's if they lead to something constructive)

THE ANSWER WAS I RUSHED AND DIDN'T CHECK MY WORK. VERY EMBARRASSED. THE /APPLICATION/CONFIG/DATABASE.PHP FILE WAS NOT UPDATED.

Environment
# concrete5 Version
Core Version - 8.3.2
Version Installed - 8.3.2
Database Version - 20180122213656
# concrete5 Packages
Advanced Phonebook Pro Plus (0.9.1), Black box (0.9.0), Centry (2.1.4), Deluxe Customizable Twitter Feed (1.0), Editor Comment (7.0), Global Version List (1.0), Handyman (1.1.0), Header Blocks (0.9.0), Highlight Links 2.0 (g) (2.0.0), List files from set (1.0.12), Login Log (1.0), Manual Nav (2.1.1), Page Activity (0.9.3), PDF Viewer (1.0.1), Phone Alpha Navigator (0.9.0), Phonebook Alpha (0.9.0), Quick Tabs (1.0), Red Alert Box (0.9.0), Redirect (1.0.0), Rescan All Files (0.1.5), Responsive Embed (1.0.1), Service data box H (0.9.0.1), Simple Slider (1.0), Spacer (0.9.3), Stucco (1.1.3), SVG Social Media Icons (0.9.9), Vivid Carousel (1.0.1), Vivid Simple Accordion (1.0.1), White Label (1.0.1), Wrap anything (0.9.2), Yellow Alert Box (0.9.0)
# concrete5 Overrides
blocks/advanced_phonebook_pro/composer.php, blocks/advanced_phonebook_pro/icon.png, blocks/advanced_phonebook_pro/form.php, blocks/advanced_phonebook_pro/js_form/handlebars-helpers.js, blocks/advanced_phonebook_pro/js_form/handlebars-v4.0.4.js, blocks/advanced_phonebook_pro/js_form, blocks/advanced_phonebook_pro/css_form/repeatable-ft.form.css, blocks/advanced_phonebook_pro/css_form, blocks/advanced_phonebook_pro/auto.js, blocks/advanced_phonebook_pro/db.xml, blocks/advanced_phonebook_pro/controller.php, blocks/advanced_phonebook_pro/edit.php, blocks/advanced_phonebook_pro/add.php, blocks/advanced_phonebook_pro/config.json, blocks/advanced_phonebook_pro/view.php, blocks/advanced_phonebook_pro, blocks/aPhonebookPro.tgz
# concrete5 Cache Settings
Block Cache - On
Overrides Cache - On
Full Page Caching - On - If blocks on the particular page allow it.
Full Page Cache Lifetime - Every 6 hours (default setting).
# Server Software
Apache

yfsneals