WEBSITE IS USING PRIOR THREE-DAY SETTLEMENT RULE TO CALCULATE EX-DATES; NEW RULE HAS BEEN TWO DAYS FOR SOME TIME.
WEBSITE IS USING PRIOR THREE-DAY SETTLEMENT RULE; NEW RULE HAS BEEN TWO DAYS FOR SOME TIME. PLEASE CORRECT AS THIS IS AN IMPORTANT DATE TO HAVE CORRECT FOR INVESTORS.
This is the third report I was able to find that describes this issue.
A change was apparently made to the Portfolio Dividend view a couple weeks ago that resulted in all the ex-dividend dates being one day too early. The reason behind the error isn't important, but correcting the error needs to be made a priority. Note that the dates are correct on the individual security's dividend history. The OP is absolutely correct that this is a very important error to correct as it impacts any income investor that relies on dividends.