My current game is in the latest TA beta (.98c[b].001).
When invading planets, I bring 21 billion (thats 21000m) troops to the battlefield. I am using a custom race based on the Terran tech tree. I have researched all techs for soldering ability. (72 advantage, 99000+ tech rating)
When I attack, I quickly overwhelm them and bring thier numbers down to 1. At that point that last solder manages to kill between 1500 ~ 3000 million of my army. While I think it is good to simulate that last ditch effort to save your world, these numbers are a bit out there don't you think?
The race I'm invading is a custom based on the Torian tech tree, and has a lower soldering ability. (55 advantage, 55000+ tech rating) The race has only population and moral bonuses chosen and is a Super Breeder.
The battle usually has me with at least 10 more points to my advantage on the dice roll before attack, though it doesn't seem to matter. I disable the odd planatery defence before invading, though that does not seem to matter either.
Anyone have any ideas what is going on here?