True. However that should be the damage displayed in the War Machine card, as well as the damage inflicted. For example, this is how the Ballista stats of a L1 hero with Attack 2 look in battle (H3):
http://i4.photobucket.com/albums/y104/Zamolxis/VCMI/VCMI%2007/090726-H3Ballistastats.jpg - and that is also the inflicted damage if the enemy is in full range
So in VCMI both the Stats card and the inflicted damage need to be updated, because VCMI displays & inflicts only 2-3 damage always.
//
The Magic Arrow formula seems correct (I didn’t check the others), but it’s not how it’s implemented in VCMI. According to the formula in the link a hero with Power 1 should inflict 20 damage at basic level. In VCMI the same hero inflicts 60 damage. And that is valid for all damage spells implemented in VCMI: they seem to be 3 times stronger than they should.
By the way, I would take the values in that link with a grain of salt. Whoever uploaded them also got fooled by the way the Ballista damage is calculated, as they give 8-12 as default value (which is probably what they had on the screen when extracting the data, simply because perhaps it was a L2 hero with +2 Attack 
//
Not me, the “AI”. But - as you said - it was probably caused by the same reason we’ve had all the other bugs regarding 2-hex creatures. Looking forward to 0.73.
