Not sure why this is happening but these five notes have dates of 543BC!
https://en.numista.com/catalogue/note204899.html
https://en.numista.com/catalogue/note204911.html
https://en.numista.com/catalogue/note204729.html
https://en.numista.com/catalogue/note204710.html
https://en.numista.com/catalogue/note204677.html
I assume it's a calendar problem but they have various different dates showing in the year lines. Can someone take a look who knows how the calendars are supposed to work?