How to stop Pages v. 5.0 from automatically formatting font

Hello everyone,

I've found after I've updated to OS X Mavericks and updated my Pages to version 5.0 that upon pressing return, Pages automatically copies the format from the line above. So, if I have a title in bold/itallic or underlined, it will mimic that formatting to the line just below. I realise that this doesn't seem that big of a deal, however, it's quite the annoyance as I find myself constantly pressing delete, taking it off, and retyping it appropriately. It also re-formats it once I've deleted the line. So if I have made a mistake and I delete the text inputted, it will reset to the same format as that of the title above the text. Does anyone know of a solution? Is there something that I can change in preferences?