conflicting copies and deleted files still appearing

I think first good coders who did core code are long time out, and new ones simply cannot adjust old code, so all old issues are with us forever, or at least until somebody will rewrite it from scratch (with danger of losing customers).

Like others on this thread I have a primary computer and use Dropbox to backup to cloud and to a secondary computer. Yet each time I power up the secondary computer and sync with Dropbox I get a number of "conflicted copies" with the name of the secondary computer. 

I never work on the Dropbox files on the secondary computer and so this is not a case of conflicting user activity.

The strange thing is that not all my ~66,000 files are marked as conflicted, and not all the files that have been changed since the last sync are marked as conflicted. I cannot detect a pattern in which files are marked as conflicted, although some of them are the very largest ones (which is a real pain as it takes a long time to synchronise them and makes a significant impact on my bandwidth allowance).

I cannot find any automatic process that would be changing the files concerned on the secondary computer 

Now I tend to keep a Cygwin window open which I am syncing the secondary computer and periodically run a 

    find Dropbox -regex '.*conflicted.*' -print0 | xargs -0 rm

But I should not have to!