Why don't some people show hexagrams?

Maybe there are too many questions to see the answers.

The reason for not displaying divinatory symbols is: 1. It may be that the master is in a bad mood or has not calculated something. 2. It is possible that before you, someone made a very unlucky divination, or the master calculated it himself, and this divination had some unfavorable signs, and the master stopped divination. 3. You can't interpret the divination according to the routine. These are normal phenomena, and it doesn't matter.