If you created the presentation on a Mac with Keynote and then trasfered it to an Ipad your issue is that they are two different programs. The Keynote for Machas all of the bells and whistles whereas the keynote for the Ipad is a lesser version. Some things are compatible and some are not. If this is what you are doing, most likely that is the problem.
The version of Keynote for the iPad is different to the version for Mac. Not all fonts, themes and effects are available on both versions.
Read this Apple Support Document for best practices: