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I am freehand editing lines to a shapefile on Mac QGIS 2.2.0, and have my snap settings at vertex and segment @ 20 pixels. The lines are roadways and I have merged them all into one feature and merged the attributes too.

When attempting to delete a handful of points together (by clicking and dragging), I noticed that points in lines way up north somewhere are also deleted. So I tried exiting, re-starting, and zooming out to see if it happened again. The extra nodes that are deleted are not selected. Also, when trying to delete the target points one by one, different points are deleted up north too, also one by one. It is as if they were somehow linked.

What could account for this?

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