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When the source and target widgets are brought together the connection between them "spikes". One of the control points has an incorrect zero coordinate. To reproduce, 1) create a graph scene 2) create two (or more) widgets 3) create a connector widget between two widgets 4) set the connector widget to use the orthogonal router 5) close the gap between the two widgets At the moment the widgets overlap, the router will route the connection widget through a point on the zero boundary of the graphscene.
There is a similar issue entered - issue #96460. I am not sure whether it has the same cause but it has the same result.
Lowering priority since it is not critical and work-around exist by improving CollisionCollector that checks for this case.