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You have activated Track Changes mode (Edit ▸ Track Changes ▸ Record), e.g. using ⇧ Shift+Ctrl+C key shortcut. This is the mode when all modifications made into the document are recorded, and may be reviewed later. It is very useful when a document is created collaboratively, e.g. when you do rounds of edits, and need to send your edits to another party for review.