Strange trigger behavior, Zammad change parameters of the trigger

Hello! I have error when create triggers. When I save the trigger with some parameters after I open the trigger again Zammad chage this parameters.
For example I have the field “category” in the ticket with such parameters:

  • banana
  • apple
  • potato
  • corn
    And I make the trigger settings like this: when user choose 2 parameters on the field “category”:
  • bananas
  • apples
    then system should choose the owner John.
    But when I save the trigger and since some times go back to the trigger settings, I see that system changed my parameters in random way for example:
  • apple
  • corn
    -potato
    And logic becomes absoluteley different: when user choose 2 parameters on the field “category”:
  • apple
  • corn

Thanx

Zammad version 5.1.x
Ubuntu server