Nodes not going where I want

Hi, I sometimes have a problem where I'm adjusting nodes on one shape, potentially on top of another shape, and the nodes will snap away slightly from where I try to place them.  I don't know if this is because of a program setting or because of an object property, but I can't find a setting controlling it and it's interfering with the adjustments I'm trying to make to nodes or line curves.  Can anyone identify the source of this?

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