Question: why does a unit not attack the closest one but automatically attack the farthest one?

https://zero-k.info/Battles/Detail/1891732

01:20 ~ 01:30

Yes I have the same problem, also when I select all my units across the map and want them to kill all last AI units in map they only attack 1 enemy unit at the time. I want them individually to kill enemy units closest to them as if they were reclaiming metal like cons.

Is there an option for all my units selected across the map to attack units closest to individual units???
When I select all my cons for reclaiming across the map they also go individually to reclaim metal closest to them...
Anyone?