Yea mine is too. and no problem if you didnt have [serverSettings] already should fix the problem. Also make sure to use the destory wild dino command to get the new levels to spawn after your server is up.
I had the same problem, common issue that noone seems to say is you need [serverSettings] typed in the box then you server changes. like so:
[serverSettings]
ShowFloatingDamageText=True
OverrideOfficialDifficulty=10.0
If that doesnt fix it then im not sure