Click and drag to move files and folders, placed them in wrong locations

I am upgrading my wiki

I have a directory tree ending in /wiki
I have the new wiki version untar in another tree /foo/mediawiki-1.43.1

In the Explorer interface I grab the contents of /foo/mediawiki-1.43.1 (all files and folders)
and I drag them into /wiki in the left hand panel.

This should move all the files from one to the other.
I have done this in the dev and test environments already with complete success earlier this week. Today though things got very strange – folders got oddly "nested"

/foo/mediawiki-1.43.1/docs
was moved into /wiki/docs/docs

/foo/mediawiki-1.43.1/maintenance
was moved into /wiki/maintenance/maintenance

every folder got copied into a doubled up name like that

I had some other strange things happen, so I'm not 100% this was a problem in WinSCP, it might have been a problem on the hosting service (Dreamhost).

They are running
I reset from backups and tried again and it all worked.

Thanks for your report.
So can you reproduce the problem or not?

I've not tried to duplicate it, but I found the log file that includes the event.

At line 6157 the problem has already happened. I do not know why 6153 does not have the same problem.

On 6153 it shows I actually made two mistakes. This is a mv command and what I had intended was a cp, but I forgot to hit the modifier key on the click and drag. (This is a result of working while tired, so the steps to cause the problem might not ever happen under "normal" circumstances. Some programming tasks I do at any time of day, but major upgrades I like to be awake and well caffeinated.)

It happened with several folders, but the docs folder is the one I first noticed it on.

Thanks. I'll look into it.

I've done this same upgrade on another site recently and no weird things happened (copy did what I expected of it) and I'll be doing it again on another site I help maintain next week.

I'm paying attention this time to see if anything happens. It may have been some weird one-off situation.

I could not identify any problem. If you manage to reproduce it, please let me know. Take some screenshots and collect a log (ideally for a smallest set of files/folders possible).