About Editing Dividends

Not sure if this is the right thread to ask my question. But I’ve noticed that my US stocks dividends generally do not tally with the figures provided here. So far I’ve AAPL and MSFT, and I need to override the ex-dividend values. Perhaps it’s because the commission that POEMS take is different from the 30% (worked backwards from the values provided on the dividend page, comparing amt with amt wo tax). Is it possible to adjust the commission rate instead of the dividend per share to fit the amount that I’m actually paid in dividend? Thanks.