Text button/label, appears to be jumping in hover state

Going a bit insane here.  I have a simple course menu with topics in text links/buttons.   There are three states:  Normal, Completed and Hover.   In the Hover state, the text appears to be jumping by one pixel or so.  As far as I can tell, they are in the exact same position.  I thought it might be something with the Text Box formatting, but they're all set the same.  Please see attached.  The bottom line of 3 topics appears to be OK; the others are jumping.

Ideas?  Thanks!

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