When importing data as CSV format, the import process ignores the "Transaction Type" column for CASH_TX and classifies everything as a "Deposit", which skews the results.

To replicate, create a portfolio with cash transactions of multiple types, e.g., INCOME, WITHDRAWAL,FEE,etc. Then export portfolio to CSV. Open CSV file and verify the "Transaction Type" column corresponds with the original data. Then import the same CSV into a new Yahoo Finance portfolio and examine the cash transactions and all of them will be DEPOSIT.