Message Book entries cannot be deleted or private/unprivated

Date & Time: 18th Oct 11:42am - Onwards
Frequency: Always
World name: Omega
Character name: C'yini Minaduki
Retainer name: Yini
NPC name: None
Monster name: None
Class/Level: Multiple
Party or solo: Both
In-game time: Recurring
Area and coordinates: Inside and Outside Private House
Housing: Shirogane Subdivision, Ward 4, Plot 37
Steps:
1. I moved to this plot recently, previously only had 1 message in my message book.
2. Another player entered a message in my book, everything is fine.
3. A third player entered a message in my book, and this message only could not be changed from it's private setting or deleted. Deleting the message or setting it to public only appears to work until the message book menu is closed or the page is changed, where the changes revert.
4. I added my own messages, and had some friends add some too. I can't change any further messages, nor can they delete the ones they've added.
5. The original 2 messages still function normally and can have their settings changed.
6. I can still delete messages I leave in *other* player's message books as normal.
7. I recently had the ability to place a retainer in my garden despite the retainer's contract having already ran out, which happened around the same time. I've since removed and replaced the retainer (as well as restored their contract via the Mogstation) but this could potentially be related.