Interactive Brokers -- Sell Stop calculated from fill price

Before the market opens, I submit this bracket order:

---> Buy stop at yesterday's close, attached sell stop at "Parent Order -2%"

The problem is: the sell stop is being calculated as "buy stop less 2%" instead of "fill price less 2%". This becomes a huge problem if the stock gaps up at the open, high above yesterday's close.

Does anyone know how to get the sell stop to be "fill price less 2%"?
 
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