already posted this issue before. https://www.reddit.com/r/AndroidTV/comments/5uzvlg/casting_issues_with_green_lines_on_the_left_for/ I reported this to the tracker but still got no response from them.
simply move to a diffrent tab It will only appears when the cast tab stays in the front
Reporting the same issue as in this closed thread: https://www.reddit.com/r/Chromecast/comments/5bfbhg/xiaomi_mi_box_produces_weird_colour_shifting_on/
Still no fix?
If you really want this to be fixed you have to report it directly to google, since this is a google cast issue please go to http://issuetracker.google.com/ and make a good report.