Certain elements displayed differently in Presenter versus ppt

After publishing my course to presenter, I notice that there are sometimes extra spaces between the end of a sentance and the period, extra spaces between words - and sometimes that space is removed. I also noticed that the tools icon is much smaller on the presenter slide versus the pptx build file. Font used is Calisto, icon element is a .png.

Does anyone know why this happens? See attached...

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