I had similar problem . Wasnt sure if it actually happened ( it was only materials in it ) so i tested it on another character with personal cargo bay 5 full with armor pieces ( that Odessen crap ) . If that bay is full and you use " sort by " option , items randomly dissapear . Sent ticket as " bug " report - got auto reply in a few days , than sent another ticket and more than 5 days passed with no reply .