Hi TTACC,
Thanks for spelling that out. Totally understand how that would throw you off, especially when you're new to the system. Possible match suggestions mainly go off name similarities, so if the surnames match it can sometimes link the wrong invoices, even when the dollar amount or initials don't line up. Sounds like that's what happened here. We've had a few other users run into similar matching issues, and this post might help too: Incorrectly auto matched bank transactions | MYOB Community.
You did the right thing fixing the allocation. Changing the category to the correct one won't break anything, so no stress there. The date flipping is bit unusual though. Try logging out of the browser, or clear your browser cache and log back in to see if it refreshes properly.
If anything still looks off after that, best to reach out to our live chat support through our virtual assistant, MOCA, or submit a case via My Account so they can check and sort it out for you.
Regards,
Sai