In Roblox Studio, the “word replacer” behavior is usually overwrite mode , and you can turn it off by pressing the Insert key on your keyboard. That same fix is commonly reported by Roblox developers when the script editor starts replacing characters instead of inserting them.

What to try

  1. Click inside the script editor.
  2. Press Insert once.
  3. Type again to check whether normal insertion is back.

If it still happens

  • Try the Insert key again, because some keyboards toggle overwrite mode on and off.
  • Check whether your keyboard needs an Fn modifier for Insert.
  • If the issue is actually with a TextBox in a GUI, that is different from the script editor; in that case, settings like TextEditable or ClearTextOnFocus may be involved.

Why this happens

Roblox Studio’s editor supports normal text editing features, and overwrite mode can accidentally get enabled, making typed text replace the next character instead of pushing text forward.

If your issue is the newer Roblox message rephrasing/censoring feature rather than Studio editing, that is a different setting in Roblox itself, not the editor.