Found a Bug with Boolean

 From:  TwinSnakes

I was making some screw holds in a base using Boolean - Difference. I arrayed my "cutters" into place and when I tried to do them all at once, some worked, some didnt. So I then diff'd them one-by-one. Got down to the last one and this popped up.

You can see the last "cutter" sitting there.

Now after I diff it, it removes the previous hole??