>What property determines the ordinal arrangement of the options in an option group? Ie, when selecting the first option, the value of the container is 1, selecting the second sets the container value to 2, etc.
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>I have an option group that is not following the rules, and clicking the second box sets the value of the container to 3, clicking the third box sets the value to 2. I thought it might be the tabindex, but they are set correctly.

I think it's the option order in the Property memo in the optiongroup record in the class table, which in turn causes instantiation order. If you look there, you may see something out of order.

Usually if you just switch them around visually they will return to normal.