Placeholders automatically inserted into section layout suffix

Sometimes there are several placeholder codes added to the section layout suffix:
These are printed as is in Word after every section.
Anyone any idea why these codes appear?

I’ve seen this happen with formats that were modified or created with the Mac version, where styles have been applied to the text. What I would do to fix the problem is delete the content entirely, save and reload the format and then apply the styles again using the Windows version.

This is a filed bug already.