You got me there. I screw that one up all the time - basically laziness. I had effect the first time and changed it because it didn't look right.
"Most"? Actually, that's incorrect according to just about every reference out there. You know, since they're cited as the most misused homonyms in just about every credible publication on the subject.
Pathetic, but thus far that's about the standard you've set for yourself.