There are two possible causes for this: 

1.  The drawer was run through the deposit process and the payments are linked to a deposit. 


2. If the payments are not linked to a deposit, this occurs when the drawer was previously run through the deposit process, but the history line item was deleted.   This removes the transactions from the deposit once it is deleted, but does not place the drawer back on the Approve closed drawers list. 

To correct option 2: 
Rerun the Create sales deposits process for the appropriate templates to deposit the transactions.