Shiptheory downloads Orders from VisualSoft using the GetNewOrders functionality of the VisualSoft API every minute. Orders that are downloaded into Shiptheory are instantly marked Downloaded in VisualSoft. This means that if you have more than 1 integration connected to your VisualSoft store, both using the GetNewOrders functionality, you may find that some orders will be missing from your account as they have been marked Downloaded by another integration before Shiptheory checked for new orders.
VisualSoft are aware of this potential integration conflict and have an item on their roadmap that covers a fix for this. For more information, please contact VisualSoft.