Following our Discord discussion, thought I'd make this ticket here since you confirmed it is something that should be looked into. :)

https://ecocitycraft.com/forum/threads/bug-report-wrong-csn-history.197650/

Paper 1.15.2 - Build 199
ChestShop 3.10.2 - Build 177
ChestShopNotifier 1.3.0 - Build 39
HeadDatabases - 4.12.1

@Phoenix616 poke?