Take it to a good gunsmith.
The reason single trigger double barrel guns tend to double is because the recoil moves the trigger away from your trigger finger and when the gun bounces back from your shoulder, the trigger hits your trigger finger again. There is supposed to be an interupter that prevents this doubling, it's usually an inertia weight that blocks the trigger during recoil.
Try shooting it with an extra firm grip on the pistol grip so the recoil doesn't pull your finger away from the trigger.
I had an SKB SxS that would double on me but only when shooting high brass heavy hunting loads.
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