port-amd64/51276: when i try to download something, there will be a file in its folder showable by "ls" but when i do a operation on it (rm,cp,mv,dd,ls on itself sometimes) these commands say its not there

[hassanabdulrahman%tutanota.com@localhost]

>Number:         51276
>Category:       port-amd64
>Synopsis:       when i try to download something, there will be a file in its folder showable by "ls" but when i do a operation on it (rm,cp,mv,dd,ls on itself sometimes) these commands say its not there
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    port-amd64-maintainer
>State:          open
>Class:          support
>Submitter-Id:   net
>Arrival-Date:   Sun Jun 26 10:50:00 +0000 2016
>Originator:     hassan abdulrahman
>Release:        7.0.1 and 7.0_BETA
>Organization:
>Environment:
i had this problem on RPI2 and amd64, i am unable to do uname now, sorry
>Description:
its just was not there. all can i discript is that i said on one-line summary. problem was with commands ftp, links , lynx , aria2c. files were damn small linux 4.4.10 iso and gentoo linux minimal installation image.  most interesting is oroblem sometimes apply and sometimes dont,  6th time i tried to download DSL it was there , but right after that it applied on gentoo linux image when i downloaded it by my RPI.
>How-To-Repeat:
download that files and see if they are there, may be it doesnt affect you...
>Fix: