I was experimenting with enchanting and noticed that when I enchant weapons with frost damage, they last for a lot more charges than what was mentioned on the enchanting screen. I enchanted for 10 frost damage and the charges were supposed to be 9 with petty soul gem, but I get a lot more, probably like double. This is kind of weird cause the Fear enchantment was actually correct. It mentioned 5 charges and I did get five. weird...