A family of Microsoft word processing software products for creating web, email, and print documents.
I've seen this sometimes happen, and I solve it by setting my defaults to be the same as the Normal style. There are several ways to do this, but I found that this way usually works for me.
Go to the Home tab and click on the tiny launcher arrow in the Styles group. This will open up the Styles pane. At the bottom of the pane, click on the Manage Styles button, and click on the Set Defaults tab. Make the settings the same as your Normal style.