I'm currently using Sketch 92, User Flows 2.3.9 macOS Monterey (version 12.4) When I create a link between artboards, if I drag one of the artboards, the flow is duplicated. Before and after dragging an artboard :  
I'm currently using Sketch 92, User Flows 2.3.9
macOS Monterey (version 12.4)
When I create a link between artboards, if I drag one of the artboards, the flow is duplicated.
Before and after dragging an artboard :
