Display differences between ppt and presenter

After publishing my course to presenter, I notice that there are sometimes extra spaces between the end of a sentence and the period, extra spaces between words - and sometimes the space between words missing entirely.  In the attached example, the tools icon is much smaller on the presenter slide versus the pptx build file as well (not a big deal, but I do find it curious). Font used is Calisto, icon element is a .png.

Does anyone know why this happens?

See attached...

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