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Explanation: I am explaining it as per my understanding. If it is wrong, please correct me. The arrow head in the interactive marker is always aligned with the x-axis of the last joint. But the last joint of my arm has the end effector attached to it along the z-axis(rotation axis). Since the arrow head always points the x-axis, the end effector and the arrowhead where not aligned.

Solution: I opened the SolidWorks model of the arm and changed the coordinate system for the last joint having the rotational axis as the x-axis. Now the arrow head is aligned with the end effector because now it rotates along the x-axis. C:\fakepath\sol.png