I'm afraid I don't see the issue. 1L60 starts at St. Pancras, goes to Ashford, then loops round to Faversham (off map) then comes back to St. Pancras. Here you are driving the latter portion of the journey.
Not sloppy, accurate. A number of services "run the loop" each day, starting at St Pancras and running out to Thanet then continuing back again.