Cmd-Tab behavior is inconsistent

I don't usually have more than 3 or four apps open at the same time but I've never had a problem using cmd tab to switch programs I do notice that generally only the two I'm switching between tend to stay static but I haven't taken notes on it. They're usually the only ones I care about at that particular moment though.

 

I don't know if you're alone in this, but I often have 8 or more apps open and the consistency of CMD+Tab to go to the most recently used app always works for me.

 

I don't know if they changed this on newer versions of OS X, but looking at it on 10.4.11 Tiger this is what I'm getting:

If you press command + tab once, the switcher appears with the highlight on the second icon, for each time you press command + tab consecutively it moves one icon to the right. Once you select an icon, off screen that icon moves to the 1st position in the switcher, all the other icons to the left of the icon you selected move to the right. So basically each time you switch to an App, that App moves to the first position and all the others slide over to the right to take up the blank space that your now active App previously occupied. That's why when you command + tab more than once non-consecutively the Apps aren't in the same position they were for the previous use. I hope this makes sense to someone besides me.