The calendar displaying the bug is on my house, purchased at the carpenter. Not sure if the calendar in town displays the same issue.
If you compare the photo I took from my game and the wiki page there's a lot of issues here.
- Connor birthday is been displayed twice, on day 2 which is Raj birthday and on the 12th which is nobody birthday.
- On day 9 only Wakuu is shown, Erika and Zoe are missing.
- On day 26 is a unknown caracter birthday, it seems to be the oracle but I've already met her, so not sure why is shown like this probably a bug related to the 1.1 update?