Edit/Display form does not show site columns after upgrade

Question

https://social.technet.microsoft.com/forums/sharepoint/en-US/580111d4-72ca-4193-87ab-1dfd6082fa88/document-set-library-column-not-showing-up-on-edit-form
Hi all,
I don't think this is related to the above question, but the linked "solution" is as good as I can come up with, however it looks like its possible that ALL the libraries in the collection are suffering the same situation...
WHATS HAPPENING:
our site was migrated to 2013 from 2010 from 2007 and is running in compatability mode around 6-18 months ago. I'm pretty sure the old system is gone too - database backups might be obtainable... not sure.
There are a bunch of "site columns" that are used consistently across the collections libraries (there seems to be a general avoidance of "content types", don't ask me why, I don't know, I also don't know what would be involved in moving
them all to content types as many of the sites "views and webparts" use the content type columns to surface things all over the place, so I suspect it would be a big job), but folks have recently noticed that some documents are missing from various
pages (webparts that are gathering documents from these columns values).
But the problem is that it seems that since the update most (all?) of the document libraries NO LONGER enforce the requirement and litterally only show "name*", and "title" in display and edit properties...
Any ideas on how to get things back to showing the "proper" forms (I can only guess what this was from documentation and screenshots and general guessing based on the "commonness" of the columns in question)? Or is there a way to merge
or migrate "columns" to content types in some way that is either "collection wide" or non-breaking?
ANY assistance would be greatly appreciated!

Answer 1

So just to be sure are you saying that '2010 compatabilty mode' is causing these issues?
Just to be SUPER clear from my end this is what I'm seeing as an example;
For a collection
with site columns
many but not all lists
many but not all list items
--> are missing valid data in the site columns that have been registered for that list.
sample:
name          modified by    doctype     department
item1.docx   username   <blank>  <blank>
item2.docx   username    WorkInstruction    Planning
if you click "edit properties" you are presented with ONLY the (I'm guessing) content types fields (eg: for Document you get Name and Title) and NONE of the other fields that should be specified.
However if you hit "save" you can see that the data in these fields returns to the "list view" (however it does not re-enable these fields from being active in the View/Edit properties pages).
Is this something that can be fixed? Or are you saying that we need to backup the DB and restore to a FULL version (not in compatability mode) of SharePoint2013? Or are you saying we need to revert to our PRE update backup and do something?
Its been many months since thsi upgrade was done and the system has changed a lot, so you can imagine we are reluctant to loose much of these changes...
Bazinga!