Smartforms - Change a text elements character Format

Hello,

I need to modify a Smartform by increasing the font size on some text elements. When I highlight the text element to change and then click the dropdown for Character Format I can click the format I would like but it never changes.

I've also tried resetting the character formats but it always gets back to it orginal size/settings.

How can I change the character format in a text element?

Thanks,

Matt