It shows up correctly in the Preview mode, but only the first line is displayed after saving. This issue has been observed with documents created/edited after Dec 1,2016. Reproducible only on Chrome. Default mode is being used in Confluence.
If this is only happening on Chrome then have you tried opening Chrome is safe mode with all plugins turned off? If that fixes it then it's a process of elimination to find out what plugin is causing the problem.
If that doesn't solve it, contact Atlassian Support because they need to investigate and provide a fix (or they need to ask Google to fix the problem in the next version of Chrome).
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