It sounds like you have 4 different animation layers, one per walk cycle. Most likely you made camera changes on each layer and the result can be what you describe. Your best bet would be to enable each layer and delete all camera movements on that layer (keeping only the movement for the figure). Make another layer just for the camera movements. Since you posted this in the Poser 10/2014 forum I will assume you have that version. ONE very big thing NOT to do in any version below Poser 11 is to use the collapse all feature on the layers. This is broken and was fixed around SR4 or 5 of Poser 11. What happens is the values keep adding from one frame to the next, instead of just adding that frames values together.

Poser 5, 6, 7, 8, Poser Pro 9 (2012), 10 (2014), 11, 12, 13