I think this probably has something to with the IdeaVIM plugin (it has some quirks) but I am just curious to know if any non IdeaVIM users see this occur.
On occasion (not everytime, but enough to be annoying) when I rename a variable or class name with the rename refactor, when I type a new name the name will type in reverse. So if I type "MyNewName" the cursor will push letters forwards and type it like "emaNweNyM".
I believe this has to do with IdeaVIM and I have opened an issue under the IdeaVIM project, I have a screen cast of it occuring in the issue.
Has anyone else ever seen this happen?