I have a document where any time I even select a particular element, it makes a connecting line go wonky. I have seen this issue a few times but thought I'd share the example. Any kind of operation (including just clicking on the element in the animation), including moving bits of the chart, will invoke this effect and the line must be detached and re-attached for it to straighten again (but will still go wonky on the next select or change).

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NOTE: wonky_line.gif is animated but the 'View' option shows unanimated. You must download the gif and open it to see the effect. Sorry! (Well, Google should be sorry, but still!)