I can't seem to comment on the JIRA for this, but I just wanted to say that I've had the same thing happening to me. Random de-listings; item names reverting to those items used for AutoFill.... and it's been going on since VMM was in beta last year. As I was told by JIRA then, 'I must be changing the names' and 'when a product runs out, it's de-listed'.
The only solution I had was to stop using autofill all-together.
And then I made a mistake: I figured, surely, they would've had it worked out by now, so I began using Autofill. Last week, I had an item de-listed as a copy because -- wait for it -- the name had reverted to the name of the Autofill item.
I loathe to see this happening to you, too, but maybe now the Lindens will see that it's not in my head. <facepalm>
For what it's worth, jic Support is watching:
https://jira.secondlife.com/browse/BUG-9991
https://jira.secondlife.com/browse/BUG-10073