The minimal example bellow shows a rendering error between a require interface and a provided interface connections:
http://www.plantuml.com/plantuml/uml/SoWkIImgAStDuKf9B4bCIYnELL1opizBoqmlBKeioSpFKr98B5P8X0Yv975nSMbeAYW55nIb9gR4v2LZg8I8SC4rAEZ2XBYueY62CNb1gScfcMMfHR4W7KLGZY5G1PojeAi1q-UGcfS2T1y0
As you can see there's a straight line between the interface and the interface require, it looks like this -(-O instead of the correct -(O
Changing order of declaration of nodes, edges may fix this, but still this shouldn't be happening.