Hi Shinje,
If you try using higher values does everything function correctly? I believe you may be running into a similar issue that was happening with this user LOD Screen Size Unchangeable - Asset Creation - Epic Developer Community Forums
Anything below a value of 0.01 gets clamped to 0 and this may be why you’re seeing the settings revert the way they are. If you can use a higher value for your LOD0 and then varying LOD screen sizes for the others you can verify this is happening.
Is there a particular reason to use such a low screen size for your LOD0?
Thanks!
Tim