Trying but failing to correct release date

Trying to correct the release date for https://www.imdb.com/title/tt11310380/reference.  The original festival release date submitted to IMDb was subsequently superseded by a new, earlier date at a different festival.  Three attempts to update the release information have been rejected due to allegedly improper formatting.

The first was declined due to "unable to verify."  I had not included any explanatory text, so that's understandable.

For the second (#210120-183446-775000), I submitted not only the revised date and revised festival selected from the dropdown menu of festival names, but also the following explanation: "Original festival and date were submitted in error. Correct 09 October 20 World Premiere information at Hot Springs Doc festival is verifiable here: https://hsdff2020.eventive.org/films/5f5939b6a6e9f300940055cc"  This second submission was also declined, this time because: "Your contribution did not meet our formatting standards."

I had correctly submitted the new date, the new festival and information for verification thereof, so apparently I had missed something in the details.  Was the problem that this was premiere screening and that I hadn't included that word per IMDb instructions: "If a release date is a special premiere showing of this title, we indicate it via a (premiere) attribute."  Okay, that's worth a try.

The third attempt (#210126-135328-716000) included the Premiere attribute in addition to the new date and festival name and again displayed the festival link as corroboration. "USA 9 October 2020 (Hot Springs Documentary Film Festival) (premiere)".  The result was the same:  Declined; "Your contribution did not meet our formatting standards."

Each submission received a green box upon clicking "Check These Updates," then came back as declined due to bad formatting with never a word of explanation as to where the problem lies.  I don't expect the moderators to fix my formatting, but "Please review our submission guides" is less than helpful; I've studied them in minute detail and absolutely positively cannot suss out what I'm doing wrong.  

Does anyone here see the problem?  If so, I'll be grateful for any guidance you can provide.  Thanks in advance!