Ok so i figured out the problem and why druids see it the worst. When there is one or more nodes in a near radius the druid since in flight form tries too leave early. However all other classes are attempting too mount however are not able too because another action is in progress. Auto loot helps but does not fix. The bot needs too sit at the ore/herb a few seconds longer and stop trying too mount while at the herb/ore.
Thats interesting, cuz i have the same problem with my DK looting mobs, he leaves to early to continue killing and forgets to both loot and skin.