So on August 5th you moved your statement date. What appears to have happened is it skipped a month (probably because the 10th was just 5 days away at that point). At that point, the website and app were still showing the 3rd or other dates, but that info was no longer correct until the date change took affect.
It seems like we've had our answer all along here as they've repeatedly said Sept 10th in all these messages, lol.
I would say for all of us here, in the future it's probably not worth advising anybody to manipulate their statement date in an effort to get points sooner. It seems the risk (of it actually moving BACK) is probably not worth it. Sorry
@Haley R that you had to find this out the hard way though