XF 1.5 How do I sort choices in Custom User Field without impacting on choices Members already done?

SuchMuch

Active member
How do I sort choices (check boxes) in Custom User Field without impacting on choices Members already done?

I have a custom user field with check boxes, Members have already checked the boxes they want.
I want to rearrange the order choices appear. When I set the new order of choices to appear, Members choices are changed.
 
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