Characters disappearing from console with LISH

I misconfigured SSH on my server and am trying to use LISH to reconfigure the OpenSSH config file. However, when I use either weblish, or LISH over SSH, nano and vi have a few unintended behaviors (I cannot effectively edit the file). In nano, seemingly random characters disappear. In vi, characters are misplaced, and I cannot edit the last character of a line. The server runs our website, and it is important that we can SSH into the server to maintain it.