Chinook coming before time though "Block Chinooks spawned by the server": true

Noticed a chinook coming before time. Was like 15 min til it should come via this plugin.
Block Chinooks spawned by the server was set to true.

Again I noticed a chinook coming too early.
I set the minimum appearance to 2 hours.
But the crate from the previous crate is still on the map when the next one comes.
Definitely earlier than 2 hours.