From experience it looks like some security feature of a plugin doing its thing and renaming the database tables. I had to rebuild the site when that happened. What you want to find out is if there is a difference in those tables. If its well written you will find that the original wp- tables or the one with the latest date wp_users_20121214_020503 -....wp_users_20141109_014715 will have the most upto date data. Then its easy coz you can delete everything else and go with the latest data. If there is differences you may need to spend some time in the backend merging that data into one again. After all these is done check how whatever that is causing it is configured. That kind of setting looks like for a very large organisation who have people in the backend full time. Have fun :)
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