Looking at the Chrome console I see the following error on pages that render incorrectly.
View attachment 725073
So basically any page that has a smile will render wrong.
You can see that in this thread.
Page 1 renders improperly because there are 36 smiles either in posts or peoples signatures.
Page 2 renders improperly because there are 14 smiles.
At this moment page 3 renders fine because there are 0 smiles.
As soon as someone posts a smile or someone who has smiles in their signature posts, this page will render incorrectly.