Why is the condition in the PC tag in phpcms?

Why is the condition in the PC label in phpcms? this is a sentence that calls subtopics. my data table is as follows:
What I don't understand is that the catid of the subtopic is not 1. Why did I write it as 1?



The above question can be said as follows:
{Pc: content action = "category" catid = "$ parentid" num = "25" siteid = "$ siteid" order = "listorder ASC "}
Why is catid = "$ parentid" a condition when a subtopic is called?

Reply to discussion (solution)

I actually solved the problem, but I still want to see what nobody understands. this problem is not found on the internet. many people who are playing with phpcms do not ask for solutions, but it will not happen when it comes to change. it is not a long-term solution.