Total Amount on OFX statement is actually Start / End Balance
When importing an OFX statement, the Total Amount field is populated with the ofx.account.statement.balance. This value is actually the account balance on the ofx.account.statement.balance_date, and not the sum of the values of the transactions on the statement.
Notes: The ofx.account.statement.balance field is taken from the BALAMT element inside the LEDGERBAL aggregate in the OFX file. This is not the total of the transactions values as can be seen from the example on page 329 of the ofx spec (https://www.ofx.net/downloads/OFX%202.2.pdf).