When adding a 2 column simple section to a page (microsite in this instance), existing content sections lose their styling.
In this example (figs. 1 to 3), I have added a 2 column section (1 full width/2x50%/1 full width). When adding the 2 column simple section, the full width containers in the first section are removed, leaving 4x50% containers.
This also affects dual-column page elements such as media with text, which, although they look OK in the CMS lose the image and have the text crammed into the left-hand portion of the container when rendered on the page (figs. 4 and 5).
Fig 1.

Fig 2.

Fig 3.

Fig 4.

Fig 5.
