Post formatting in 3.9 showing different sizes to previous posts

Hi all.
not sure if anyone else has experienced or not.
But when publishing new posts the fonts are showing much larger and the formatting is completely different to previous posts.

H1 headers are much larger, and my main paragraphs and fonts are all larger to. I am using the same font and sizes as all previous posts in the past as well.

Does anyone know how to fix this?

I am also using the ultimate tinyMCE plugin, but i would not think that is the issue but more so a wordpress issue?
(Update: now using wp-edit and same issue)

2 examples of different posts are as follows.
Warning: NSFW…

https://adultsexstore.com.au/tutorials/sex-toys/learn-about-cock-rings

https://adultsexstore.com.au/tutorials/sex-love-relationships/improve-your-sex-life-the-best-sex-tips

The 2nd link is the format i want the posts to be in.

Cheers.

https://wordpress.org/plugins/wp-edit/