system : ubuntu 16.04
vim version : 7.4

Thanks for the report. I'll take a look
@wuqiong4945 Sorry for the long delay.
I am not able to replicate the issue. Do you still have the issue with the latest version?
Which keymap is this? u or U or something else?
@wuqiong4945 Ah okay now I see it. It is with U (uppercase U)
I have encountered this bug, initially in a different way but I also tried by pressing u and it still happens.
Here are the steps that reproduced the issue for me:
e../ with <CR>
I have also noticed that the behaviour is different depending on whether let g:DevIconsEnableFoldersOpenClose is set to 0 or 1.
In my recording above, I have set it to 1. When the issue occurs, the icon gets fixed by cycling open/close status for the particular folder. If it's set to 0, instead, cycling open/close the folder doesn't fix the appearance.
@ryanoasis I am having this problem even now.
Reproducible just by
This only happens the first time I go to the parent dir, e.g. press 'u' when first time open nerdtree or after I jump to a bookmark.
Tested with a minimal .vimrc below and on Archlinux, urxvt, vim 8.1, Hack nerdfont and plugins fresh installed.


.vimrc:
call plug#begin('~/.vim/bundle')
Plug 'scrooloose/nerdtree'
Plug 'ryanoasis/vim-devicons'
call plug#end()
I have the same problem, too.
Most helpful comment
I have also noticed that the behaviour is different depending on whether
let g:DevIconsEnableFoldersOpenCloseis set to 0 or 1.In my recording above, I have set it to 1. When the issue occurs, the icon gets fixed by cycling open/close status for the particular folder. If it's set to 0, instead, cycling open/close the folder doesn't fix the appearance.