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That's a fairly common problem (see the section "When my object is turning in a circle, it suddenly spins around in the opposite direction for no reason!" from this thread:
http://modthesims.info/showthread.php?t=239168 for a proper description of what's happening and why.)
The way I normally fix it is to manually edit the file, either in
SimPE (which is slow, but familiar) or as a text file (which is faster, but more likely to fail spectacularly). Either way, if it's happening at a key point in your animation you haven't really got much of an option but to manually fix it in the anim file - Milkshape can't do it.