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Not enough drones for all the work they have to do. It may flactuate if they have to load/unload a ship or carry building materials. But if there is no ship nearby and nothing being built you should consider adding more drones to this hub or build a second one overlapping.
 
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Its a representation of the queue of tasks they have. If there are more tasks than drones its considered heavy. This can give a false impression. A ship landing puts as many jobs in the queue as fuel needed to take off. So load immediately spikes to heavy. This isn't a problem. What can be a problem is when you are in heavy load for just normal maintenance. Lugging food around, doing repairs and the like. That can lead to things breaking down.