Styling segmented cased lines in QGIS

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My client wants a map of bus routes rendered as white lines with blue casing. I'm using QGIS 2.8.2 on Mac OSX 10.10.5. I found a .kml dataset here: http://developer.trimet.org/gis/data/tm_routes.kml. I also tried using the .shp. The problem is: When I add the layer to the map and apply a cased line styling, some of the routes render as nice unified lines and others render as segmented, like earthworms:



So I could easily cheat and render a duplicate layer (featuring only the thin white lines) on top of this one, but I really want to understand why the lines render in different ways. I'd also like to know if there's a way to render them all as unified. Thanks in advance for any useful suggestions on either front.



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