My units, (Land, Air, naval or building) will attack other units, or vise versa, and when the unit reaches zero hit points, there is no explosion or reclaimable wreckage, just a flaming unit that I can't click on. Crashing air units will explode and can be reclaimed, but if they're killed while being landed on the ground, then they don't explode.
Any help would be greatly appreciated.

