Piping Route not constructing correctly

I have noticed a problem when cnstructing pipe runs, I saysometimes because this does not happen every time and it it quitebaffling.

I will start a pipe run by right clicking on a flange connectinpoint and selecting start run" I will draw a 3D sketch which isfully defined and the route can be seen forming along the sketch asit is drawn, putting in all of the bends, etc. Upon exit of thesketch and saving the route you can see that the pipe run has beenconstructed from extrudes and revolves.

In other circumstances when creating the route in what seems likeexactly the same way the route will be formed from straight runs ofpipe and 90 deg elbows as seperate items within the route.

I have no idea why. Could anyone offer any suggestionsplease?SolidworksRouting