Commander view remote folder panel shows identical folder below where folder is a number

VERSION: 5.15 (Build 9365)
PROTOCOL: SFTP
VIEW: Commander
WIN10 x64 (latest)

Weird one this - if a remote folder is a number under 4 digits long, when clicked in the top remote panel, it "clones" to an identical folder below. But only in the GUI, not actually on the server. So, 12 and 123 clones itself, but 1234 doesn't.

All other folders seem to behave OK

A screenshot will probably explain best - please see attached. What can I send to help figure this out? Don't know when it started happening because I've only just started working with this list of numbered folders.

Thanks for your report.
I have sent you an email with a debug version of WinSCP to the address you have used to register on this forum.

This bug has been added to the tracker:
https://winscp.net/tracker/1736