How do I get auto-adjust to "stick" when setting up a scheduled transaction with splits?

I have a scheduled transaction that has three categories, one of which is Utilities. That's the only part of the transaction that changes each month, so I go into the Transaction Details, click on Splits and click on the radio button under "Auto-Adjust" next to the Utilities category. When I go back and look at the Splits again, the button on the total is always selected again. How can I get it so that when I update to the total for the transaction after doing Mark As Paid, it updates the Utilities category rather than creating an empty extra category with the difference?
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