Taidel.
When you see 68% chance to hit, it isn't a guaranteed hit every two turns. Instead, it resets after every move. When you miss, the next turn's chances of hitting are also 68%. It's giving you a general range of your possibility of hitting. This is where the dice rolling comes in.
If you roll a regular dice, and you have 3 of the sides marked, would you say that you will always roll one of the marked sides after every two rolls? No. It's a 50/50 chances, but after every roll, it resets back to a 50/50 chance again.
You're just really unlucky to supposedly miss 30 times, though that's almost as lucky as hitting 30 times in a row.
 "Arkandian Crusade"){kind=icon}