I had actually forgotten to change the names of the X10 and X30 routes back. While mapping-out the routes, I used codes to denote if the routes were heading via different locations (BH for Broomfield Hospital, GD for Great Dunmow, GW for Great Waltham), as opposed to running directly between Stansted and Chelmsford. These have been corrected in changeset #168568254: 
https://www.openstreetmap.org/changeset/168568254