So if you have two crossbows in your off hand and in your main hand it will be kinda glitchted or maybe it is designed like that i think it is a bug!!
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duplicates 1
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What are you referring to exactly?
If you are referring to the crossbows going into each other it is because items in the players' hands do not collide with anything.
If you are referring to the collision of the crossbows and position of the off-hand crossbow when charging your main-hand crossbow then it is again because the models don't collide and all items in the off-hand will follow the reload animation.
Same issue as MC-137946, which has been resolved as WAI
Probably a duplicate of MC-137946.