CSS not being respected consistently

This seems kind of bizarre, and I’m not sure what to do about it.

I’m in the beginning stages of setting up a new website using WP.

I only have the first article written so far but I’m already seeing a weird CSS inconsistency.

When you first load the website (PostMiracleParenting.com) the opening article loads without some of the CSS being used. But, if you click the article name on the left side under Recent Articles, then the article reloads and this time looks correct.

Is this a problem with the theme, or is it something else? (I’m about to hire a person to create a new theme for us from scratch leveraging our existing branding, so if it’s just a theme issue then I’m not going to worry about it. If it’s something else, though, then I need to address it.)

Thanks,
Marshall