Lagun Table issue

Hello all--I had to order a replacement "arm" with bushings already installed from Lagun because the old arm had a bushing completely disintegrated and had been sagging lower and lower on the end opposite from the upright support arm over the last year or so.  I just got the new arm and it is STILL SAGGING??  Anyone know what is going on with this?  The bushings and the plastic tip on the upright post are all in brand new condition.  So disappointed.