Submitted by said, also found by sashik_eth
https://github.com/code-423n4/2024-01-init-capital-invitational/blob/main/contracts/hook/MarginTradingHook.sol#L373 
https://github.com/code-423n4/2024-01-init-capital-invitational/blob/main/contracts/hook/MarginTradingHook.sol#L380
When fillOrder is triggered, and the orders collateral size inside the position manager is empty, it should change the order status to canceled. However, due to mistakenly updating memory data instead of the storage __orders data, it will not be canceled properly.
It can be observed that when collateral size is empty, fillOrder will try to update order memory data status to OrderStatus.Cancelled and return the call.
https://github.com/code-423n4/2024-01-init-capital-invitational/blob/main/contracts/hook/MarginTradingHook.sol#L379-L383
However, this will not change the storage value of the order inside the __orders data. This will mislead users into assuming that the order is canceled when, in fact, it is not.
Update __orders[_orderId].status storage data instead :
fez-init (INIT) confirmed, but disagreed with severity and commented:
hansfriese (Judge) commented:
