Update from 2.1. to 2.2.

Hi, i do the update from 2.1. to 2.2. and now I can´t change the text style in the content. An example. I create an Articel and in the content I use the tag <h3>Text text text</h3>. In the article the h3 tag is correctly. But when I change to the Startsite nothing happens. Coult you help me please? Thanks Robert