Avoiding rom rcorruption tips

so when editing music, i noticed that i have been getting some rom corruption in the overworld map unless it is because i am hex editing a modified rom or i used zone doctor for hex editing.

I'm not sure how reliable is Zone Doctor hex editor... the general tip is to avoid Zone Doctor altogether. For hex editing you can use HxD or Windhex and for map stuff FF6LE. There's not much Zone Doctor can do that other utilities can do so it's possible to live without it.