Selecting Date of Birth not matching

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Date & Time: 22:21
Frequency: Always
World name: N/A
Character name: N/A
Retainer name: N/A
NPC name: N/A
Monster name: N/A
Class/Level: N/A
Party or solo: N/A
In-game time: N/A
Area and coordinates: N/A
Housing: N/A
Steps:
1. Selecting Date of Birth in character creation choose Sixth Astral Moon, 17 (11/17)
2. Notice the number above the confirm button says 11/16.
3. Look and see that the 7th and 8th buttons both visually says 11/7
4. This happens elsewhere in the date of birth selection menu (29 & 30 both give 11/28, Fifth Umbral Moon 28 & 29 give 10/28)
5. I do not know if this is solely visual or has any actual impact in the selection.
*Add more steps if necessary

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This isn't a bug--the Eorzean calendar does not match 1:1 with the real Gregorian calendar. Some Eorzean months have 32 days, even. It's part of the lore of the game.