Change in page since installing 4.5.7

Since upgrading from version 4.5.2 to 4.5.7, we have seen a change in the way that some custom post types are being displayed.

1. The first problem is the displaying of the content.

Prior to upgrading to 4.5.7, we had a Color Section at the top of the page with a background image. We then had a 3/5 column with a 2/5 column beneath the top Color Section. (See Private Content Link A) Since upgrading to 4.5.7, the top Color Section with the background image is appearing BEHIND the 3/5 and 2/5 columns of content. (See Private Content Link B)

The only way that I have been able to correct this issue is by including the 3/5 and 2/5 columns within another Color Section. (see Link C).

2. The second problem pertains to the responsiveness of the grid and columns.

Prior to upgrading to 4.5.7, a column of content on the right side of the screen would “slide” beneath the content to the left on a mobile device. However, after upgrading, the columns of content stay beside each other but shrink in width. (Please see Link C at a mobile sized screen width or Link D screenshot) Prior to upgrading to 4.5.7, the tan box on the right would “slide” beneath the content to the left when viewed at mobile screen widths.

I have columns set up on pages and they are responsive and react the way it has in the past. Prior to 4.5.7, I had also added the required code in the functions.php file to register the post type as explained here: https://kriesi.at/support/topic/activating-advanced-editor-in-custom-post-type/

Both issues above are with custom post types and do not appear to be occurring with normal pages.

Thanks for your help.