Well, it would be good for it to be fixed, as if you have Master Scouts you should be able to attack a lair and on the same turn loot the lair, and even without Master Scouts you can often do that.

If you don't have Master Scouts or a Compass, I find you tend to use up however many movement points attempting to attack an adjacent tile in Strategic view that moving to that square would -- if its hills or forest, it consumes 2 movement points.

If you have a trait or equipment that should eliminate the movement penalty for moving through forests/hills/etc., that probably is a bug.

It happens because of being webbed/bashed/stunned/etc... An unit ends the combat with 0 move, and your army's move gets set to the minimum of the units' moves.

Whether this is the way the developers want it, I do not know.  I personally hate it.  But then, I also hate that I need to move twice to attack and loot a lair.  I believe that we should have the choice to KILL (approach, fight, move back) or RAID  (approach, fight, stay) and they should cost the same (or at least, RAID should cost less, given that KILL has an extra action, at least if looting take as little time as is suggested in the text.