Hrm. I've found in working with the spline modeller that it doesn't always "get" the point-to-point. Sometimes it insists on linking points that are off in some other part of the cross-section. This does look, as falcon points out, very much like the connection is rotated; point 1 connected to point 2, point 2 connected to point 3, etc. I've sometimes cleaned up that sort of problem by deleting the problem cross-sections and re-duplicating the section before. But I would also be very tempted, especially on a simple shape like this, to do the whole thing in vertex modeller in first place where you see the final polys as they are created and can fix strange links immediately.