Video:
https://qaq.cat/wp-content/uploads/2017/01/problem-with-xterm-screen-vim.3gp
As the video I recorded, xterm has this problem, while ansi doesn’t.
I also tried xterm-16color and xterm-256color and the problem exists too.
PS: The “Contact” of http://support.codinn.com/ seems broken. When I tried to send a feedback, it shows “Connection Reset”.