not 100% sure, but maybe the duplicates are actually nulls.

if you display the UUID fields in a list form, and resize the window, do the 
values change?

if yes, what you see are phantom UUIDs, there are actually null.

I assume you added auto-generating UUIDs, 
I assume you did this in a v17.4 structure file, 
I assume you opened a v13.x datafile,
expecting that the newly created UUId filed would automatically be populated.

my question is, did the primary key wizard show up?

or maybe I should ask, is the UUID also a primary key?

> 2020/03/28 0:44、Chuck Miller via 4D_Tech <[email protected]>のメール:
> I have code that added a UUID to all tables. I then restored from backup from 
> a v13 database.
> I would have assumed that all UUIDs would be filled. Indeed, most of them 
> were, but there were a few tables where there were duplicate values. Any 
> ideas as to why

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