The Top-Most Card ceases to have its Might modulated by the Might Bonus of the card being Detached.
§ 435.1.e Core Rules PDF (officieel)
§ 435 Detach
§ 435.1 Detaching is the act of unlinking two cards that are currently linked through the act of Attaching. This causes one to cease being Attached, and potentially causes the other to cease being a Top-Most card.
