Most of the bike lanes I have mapped were mapped previously as "bike tracks" (the remaining ones that I have mapped are new bike lanes that are physically separated with curbs). According to the wiki, a "bike track" is considered to be the same as a "cycle path" and they can be used interchangeably with a "cycle path" being preferred. They were most likely previously mapped as bike tracks because they can be mapped more quickly than drawing out the entire cycle path.  There are also cases of bike lanes protected by flex posts that were mapped by others, such as Garden Street in Cambridge, Mount Vernon Street in Somerville,  Cambridge Street in Cambridge, and Western Avenue in Boston.