Table format breaks

Summary

• A user reported us, after creating a table, that it appears without "table formatting" in the description field

Steps to replicate

Scenario1:

1. Go to Service Desk project - Queues
2. Create an issue by choosing "Create" button
3. Choose any project (not nessesarily Service Desk project) and any issue type
4. Go to Description field and choose "Visual" view.
5. Press "+" icon and add Table
6. Add summary and other mandatory fields
7. Press "Create" to save the issue
8. View the issue.

Scenario2:

1. Go to Service Desk project - Queues
2. Open existing issue in the view
3. Start to edit Description field (or create/edit a comment)
4. Press "+" icon and add Table
5. Save the update

Expected Behavior

• Issue shows a table in the description.

Actual Behavior

• Open created issue and sees a broken table
  • First example:
  • Second example:

Notes

• Replicated with Google Chrome and Firefox.
• Internet explorer seems to work properly.
• The issue does not appear to be present in JIRA 7.4.0 (tested with Chrome 60.0.3112.90 (Official Build) )