Sammynammari posted a fix for a similar problem here on github. It is caused by the vi-mode plugin so you must disable it until it has been fixed.
Open up your .zshrc file and remove the vi-mode plugin from the plugins list.
Before:
plugins=(vi-mode)
After:
plugins=()
Once you restart the console it should be fine again. If it doesn't work then try disabling all the plugins, then if that works gradually re-enable them one by one to find the culprit.