Markers: Adding and editing text is unstable, can't see all text

I'm adding numbered markers to a type of graphical map that is a backdrop to steps in a "process".  User clicks on marker and gets text that describes the step.  As I'm adding text to the box, the bottom lines disappear and my cursor is not going where it should.  I can see the resulting problems when I preview it.   But I can't see it while editing.  I've tried resizing the text box but that doesn't help.   It just appears that the text editor is unstable.  Any ideas?  Thanks!

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