Incorrect Dividend Amounts After Importing Transactions

Hi, I imported all my transactions from my brokers and uploaded my holdings via an Excel spreadsheet. However, I noticed that many of the dividend amounts in the system are incorrect. For some dividends, the amounts are only slightly different by a few cents, but others are completely incorrect and I cannot find the corresponding amounts anywhere in my Excel spreadsheet or broker records. I have no idea where the system is getting these figures from. Could you please look into this and explain how the dividend amounts are being calculated or sourced? Correcting these discrepancies manually is also taking a significant amount of time, especially given the number of transactions involved. I would appreciate it if you could help identify the cause and advise whether there is a way to correct the data more efficiently. Thank you for your assistance. Kind regards, Janie