In Wyoming, it’s not criminal trespass unless you have been notified by the property owner or law enforcement. So perhaps one of the first two encounters included such notification.

https://wyoleg.gov/InterimCommittee/2019/01-2019060313-01LSO...

The article doesn't say that the ticketing officer was in the other two groups of officers. So, it's not clear that your assumption is correct.

  First, the local game warden arrived with *two sheriff's deputies.*
  ... 
  The next day, a *sheriff’s deputy* arrived...
  ...
  Finally, *a third law enforcement officer* arrived with direct
  orders to ticket the hunters, not for hunting without
  permission, but for criminal trespass.