Checks and deposits posted and then shown different -Change traceability

Is there a way to track if my accounting clerk changed a transaction after it has been posted and reconciled. I got a weird situation, where I cut a check for 2 invoices and have the print out. Later, upon further reviewing, that same check showed in the system differently, paying other 2 different invoices. I believe may she un-clicked by error or I am not sure what may have happened. It also happened with a deposit. I have a print out of the deposit made and received at the customer level. Suddenly, when following up on collections, this same invoice was now not showing as paid. I believe she may not notice that she changes the transactions or I am not really sure what the situation may be. This is why I am wondering if there is some traceability in the system.