@Serendipidy: It sounds like you are describing the very common mistake of turning too early. The lady should pass in front of the man, making good use of eye contact through the window of the joined raised hands, before veering away to make the shape of a hockey stick (be it ice hockey or grass hockey). This is part of the 'will she/won't she' sexual chemistry of rumba.
@Iluv2Dance: It is common to regard turns of 1/8 or less as a curve instead of a turn so the term Forward Walk Turning was generally reserved for where there is a definite change in direction made on the stepping foot, particularly when changing from forward to backward movement such as on the next step of the hockey stick.
Incidentally, the term appears not to be used in any recent technique books.