I can't seem to be able to upload images, so I use links from imgur.

 

this is my character

 http://imgur.com/i8O6LGh

 

this is my weapon

 http://imgur.com/U6vPjww

 

and this is the combat log

 http://imgur.com/fZ40KBe

 

You can see that my damage dealt before DT is 19.1.

This means my damage before might would be 19.1 / (1 + 0.33) = 14.3,

which is not within the weapon's damage range(16 - 24).

So might is clearly not affecting auto attack.

 

 

And another bug:

http://imgur.com/x6RM4UZ

 

just completely wrong

Nah. Notice how it says (Base: 13-18)? That's your weapon's base damage. The 16-24 in your weapon tooltip is actually calculated after taking Might into account. 16-24 is your final expected damage range, AFTER Might has been added into the equation.