What version of InDesign? Do you have Service Pack 1 installed?
CC2018 latest available. I re-installed new download.
I have the same problem. Adobe, please help.
tried this with InDesign CC 2018.1 188.8.131.52 on Windows 10 version 1803. German version.
No problem to change the document preset [Standard] . My margins are now 10 mm.
Sorry. I cannot recreate the problem…