Cannot use key Cmd+s or 'Save'

When I use the key ‘Command+S’ to save or click on the ‘Save’ menu item, the changes just made resort back to the original. Almost like the Cmd+s command is actually a Cmd+z (go back) command. Is it just my situation or have these two been switched in this update?

Also, this version freezes after I’ve do a number of activities in v1.0.5 on my Macbook, OSX 10.13.5