I've heard poeple say medium is actually very hard on the campaign map battles, however, in custom battle mode, I find easy and hard to be glitched (as in, easy mode's morale bonuse, but hard mode's combat malus and vice-versa). Could custom game's combat and the campaign map's combat be bugged differently ?

I would be overjoyed if someone with more time would do some research, as it is a very important issue.