Maintaining Font Changes

I downloaded Fruitful at the end of last week and really liked the look of it. However the first issue I’ve encountered is a loss of font changes. I changed the header to “Lobster” in theme options, fonts and when I went to my view website it looked great. At some point during future amendments it stopped displaying, reverting to the default. Yet in fonts it maintains it has been switched to “Lobster” – why won’t out display?