Report binding Nested Query, Sub Table can’t show all rows?

Version 8.1.24

SQL Query : SELECT id as customerid ,name,addtime FROM customer where state=1 and type=1

Nested Query:SELECT id,no,addtime FROM contract where state=0 and customerid=?

add Parameter {customerid}

Design:

Table + sub Table

Preview:

In Preview,I can see Table data and sub Table data;

But in the sub Table ,can’t show all rows?

Table Details height:300
sub Table height:278