Display problem on Blog if posts include images aligned to the left

Steps to reproduce:

1. Create a blog post
2. Upload an image in the Content section using the Image -> Attached Image menu
3. Click on "Image Settings"
4. Select the Left Horizontal Alignment
5. Click "Insert Image"
6. Tick the Publish checkbox
7. Save the page
8. Repeat steps 1 - 7
9. Go to Blog.WebHome