The trade was DD SGH into DD canf. Once DD those two position are merged for the contest they can't be unmerged. So once you DD SGH, when you traded SGH to CANF that was DD automatically as the whole SGH position was transferred to canf. The same thing will happen again if later on in the contest you trade CANF for STOCK A, all of CANF imaginary proceeds go into stock A in this example, hence stock A will be doubled down as well. Hope this helps.
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