Just another cases of the multiple control interaction that exist in the flight dynamics of the helicopter, that translating tendency can couple with your action on the lateral cyclic when you really try to nail a perfect touch down.
on touch-down its very easy to overfocus on the cyclic control, while all the time its the sloppy work on the pedal that create varying translating tendency and the bulk of your poor lateral control.
For example the AS350 has this typical wobbliness sneaking up on you as you try to land it,
due to ground effect air flow around the tail gets lousy --> tail thrust get a little less predictable --> pedal work increase --> translating tendency fluctuates --> lateral cyclic gets sloppy playing catch-up --> fail to impress with masterful touch down