Powerpoint, font size, slide master

I'm having a problem with Powerpoint. When I save the presentation, in one specific slide the font size reverts to the font size setting in the slide master.  So on Slide #2 for example, when I save the slide the text is in 28 point, but when I re-open the presentation the text is now in 32 point, which is the setting for the slide master.

This only happens on this particular slide, though.  All my other slides keep their font size regardless of the slide master.

Any ideas?