Chip: You might have read that here, under 'operating instructions' tab:
The Fenix E18R V2.0 is an ultra-compact EDC (every day carry) flashlight that is rechargeable with 6 lighting modes and a max of 1200 lumens.
www.fenixlighting.com
...where it is stated: (note the stated exception is actually listed as being 'turbo and strobe' rather than 'turbo and moonlight')
Intelligent Memory Circuit
The light memorizes the last selected output excluding Turbo and strobe. When turned on again the previously used output will be recalled. The High mode will be activated when turned on again if the light is turned off on Turbo mode.