I had this last year on some preferreds where they reflected it as the wrong type of dividend when paying it (non-qualified instead of qualified, or even interest income) which is really just how Schwab reflects the transaction type, and had to correct the classification between these categories for final tax reporting. If this is a similar situation to what you are seeing, then it's just noise in the detail - all these adjustments should add up to zero across these categories and then check the final net amount in the 'Amount' column, this should correspond to the totals on your 1099-DIV.
