from the chart of accounts, run a report on OBE, click that transaction and see what made it.
OBE, should be cleared to equity after all opening balances are entered, at that point it is zero and should stay that way.
So for OBE to change, you had to make an entry that posts to OBE, either a journal entry (which should be avoided when possible), an adjustment to inventory where you used it as the adjusting account, or you created some account and entered a starting balance
