While contemplating a trip to another CX today I found that as I was sliding down the Reactor usage, sometimes my APP leg of the trip would get shorter using less reactor. By playing with it more I found that I could actually significantly reduce my trip time and FTL fuel consumption by getting this apparent bug on the approach leg of the trip to show up when reactor usage was low. Didn’t seem consistent either, as I would get different APP distances at the same settings if I moved the slider several times. I didn’t make the trip so I don’t know if my actual trip time would have wound up being what was stated or not. I’m using Chrome for browser.
I also have something similar, it gets even more weird when you click the same consumption again. The resulting time is not consistent but might change (I had 13:47h and 12:14h for the same consumption).