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One thing that is useful to do with such issues is to use Help->Send Feedback to send in a scrambled version of your document (you can click on the link for the attachment in the message created if you want to verify that nothing sensitive is shown), along with a description of the problem. Be sure to use the WBS numbers or the scrambled task names to refer to the tasks :-)

Doing this eliminates any possibility that the problem isn't really something else, and if it turns up a bug, they can add a suitable test case to their future testing to prevent a regression.