It is probably a sloppy mistake, ineptness, and poor process controls by a contributing team, not pure malevolence. In a survey paper some people are sloppy and copy/paste source material directly into their file and edit it, or instruct others to do edits with notes. This creates a large risk that the edit never happens or the wrong version is submitted.

Edit: also take into account plenty of these researchers write English as second or third language. Copied text won't necessarily sound as obviously out of place and process becomes even more important.