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I believe there are two types of cross bows, hand crossbows (which you can dual-wield) and regular ones (which you can't dual-wield).
my guess is that last night you equipped 2x hand crossbows and today you tried to replace one of the hand crossbows with a regular crossbow which you wouldn't be able to do until you unequipped both hand crossbows.
just re-check the "fine-print" of the items to see if you missed something.
regardless should probably put in a bug-report, if you try to perform an action and it isn't able to be completed it should give you some feedback based on the exit condition.
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