List box weirdness

I have two list boxes on one of my user forms. The two list boxes are used together
to create criteria for an autofilter sort that I do. There are 7 items listed in on list
box and three in the other. The code behind the scenes works perfect for 6 out of the seven
items in the first list box. There is one that won't do anything at all when I press the command
button to do the autofilter. I'm confused because I cut and paste all the code and just changed
some of the criteria for the autofilter for each item. I have looked at the code a million times
(which is only about 8 lines for each autofilter). Every other combination works between the two
list boxes except for when I choose that one item from list box 1. Have I confused anybody yet?
Any suggestions? Does anybody know what is going on? I'll send you the workbook if I have to.
Thanks in advance.