Over the years, I've noticed that the lunar distance as given by the app does not agree with other sources. Usually they are off by a few thousands kilometers. I wonder if this is due to the different database or calculation the app developer is using.
For example, the closest full moon for this year is suppose to be the April's Pink Moon, but according to SkySafari, the March's Worm Moon was closer.
Below is the comparison between the lunar distance value as in SkySafari 6 Plus, TheSkyX, and Astropixels.com (by Fred Espenak, which is also reference source for Space.com). I am unable to obtain data from USNO (which is my primary data reference source) due to their current site upgrade.