Wrong GL account number appears on printed General Journal transaction

Hi

I've just noticed when I print out my General Journal transaction for an accrual I do each month the income accounts change number. Ie the transaction is posted to account 4-0313 or 4-0312, yet when I print the General Journal transaction the report shows them as 4-3130 and 4-3120 which don't even appear in my chart of accounts. Confused!

Thanks