I am a newbie to panorama photography and NN. Finally got down to using my NN4 and R-D3L EZ-Leveler-II 6-8-30 and I have a problem levelling the R-DL3 and hoped someone might be able to help.

Following the instructions in the manual. I get the bubble on the level centralised but as I rotate the head through 90, 180 and 270 degrees the bubble drifts off before returning to a central position when I turn it back to 0. I understand that the level is very sensitive but the bubble is part outside the reference circle at some points. I have checked this on a solid floor and with 2 different tripods.

Has anyone else experienced this level of drift?

Thanks in advance.