How to investigate a trade:
Step 1 - We look to see if there is anything obvious in the MT4 Manager. Then we check the charts. Was there supposed to be a pending order? Or was it entered in via Market order...
Right-click in history and go to "Columns" then go to "Reason" that will tell us if it is placed via Mobile, Desktop or Expert Advisor
Always get this information when investigating a trade:
What happened
what time
What ticket number
What Login
What currency pair
What was your expected result?