Sketch driven pattern is staggered?

Hi,

I have a bunch of tubes, placed with a sketch driven pattern. 2 days ago, the pattern worked just fine. Then suddently (without editting anything relevant to this), the tubes have moved. As you can see in the pictures, i've placed the "base" tube in the lower right corner. The tube is there, but Inventor has also placed another tube in the same place, just moved.
If Í look at the assembly in half section view, it looks like the tubes are centered about the sketch.
Any idea of how i make this work again?

You can see the correct placement in the picture with the blue component.