Well, BlizzABS overrides the configurable controls, so that's probably why. But he has a section in that script where you can set the controls inside the script editor, rather than from the F1 dialogue.
I don't really know what the problem is in the other case. Does the problem not occur if you do not have Blizz-ABS in your game?
Also, for questions on scripts, your best bet is to ask the author in the topic that you got the script from. As long as they are active, they will know their scripts better than anyone and are therefore more likely to get you a fix quicker than from anybody else. Also, if it is a problem with the script, then you are doing them a favour by telling them so they can fix it in the next version.