Column Macros located in Section Macro appear under each other on the main page even though they appear side by side in the preview mode of Global Template

Issue Summary

This is reproducible on Data Center: (yes)

Column macros in Section macro appear side by side in the preview mode of Global Template, but on the welcome page they appear under each other.

Steps to Reproduce

1. Setup a Confluence 8.5.6
2. Navigate to General Configuration —> Global Templates and Blueprints
3. Edit Default Welcome Page, or create a new one.
4. Insert a section macro
5. Insert to column macro with 45% width
6. Click the preview and they appear side by side.
7. Apply the settings and navigate to the main page
8. Column macros appear under each other.

Expected Results

Column macros should appear side by side on the main page as in the preview mode.

Actual Results

Column macros appear under each other.

Workaround

There is no currently any workaround for this issue.