Another method of reproducing the issue is enter the directory by pressing the "Enter" key, and then the backspace key to navigate 1 folder up. Same issue. Want more screenshots?
Want my keyboard model/drivers?
I have a microsoft intellimouse explorer /microsoft natural keyboard with default drivers (Don't you dare to advise me to update mouse drivers/contact hardware manufacturer for a fix, since i am a computer technician myself).
Issue can be reproduced as 1-2. Just take a subdirectory with a VERY long listing, then just enter it and while it is listing folder contents, navigate to parent folder...
On the screenshot on the previous post, the ftp i'm browsing is
ftp://trumpetti.atm.tut.fi/gentoo
Will you agree that it doesn't resemble what you see on the screenshot?