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bind 9 can not balance load with mode order cyclic

I configured bind as dns server on centos 8 and create a zone file named test.com.zone,the contents as follow:

$TTL 1D
@   IN  SOA  test.com.   root.test.com. (
                        2020072603     ; serial
                        1D      ; refresh
                        1H      ; retry
                        1W      ; expire
                        3H )    ; minimum
@          IN NS      master.test.com.
@          IN NS      slave.test.com.
slave       IN A    100.100.5.21
master       IN A    100.100.5.22
www   IN A   101.101.5.21
www   IN A   101.101.5.22
www   IN A   101.101.5.23
www   IN A   101.101.5.24
www   IN A   101.101.5.25
www   IN A   101.101.10.245
www   IN A   101.101.10.246
www   IN A   101.101.10.247
www   IN A   101.101.10.248
www   IN A   101.101.10.249

the Subnet Mask of ip in resource records above is all 16 bits,when i ping www.test.com from client for 10 times,the ip it allocates is 101.101.5.21 for 6 times and 101.101.5.22~25,it can not allocate the ip of 101.101.10.x,is it any limit for the ip in resource records? and then I modified the resource records in zone file as follow:

www   IN A   101.101.5.21
www   IN A   101.101.5.22
www   IN A   101.101.5.23
www   IN A   101.101.5.24
www   IN A   101.101.5.25
www   IN A   101.101.5.26
www   IN A   101.101.5.27
www   IN A   101.101.5.28
www   IN A   101.101.5.29
www   IN A   101.101.5.30

and I also ping www.test.com from client for 10 times,when the clients' operarte system is centos 8,it can Poll all the ip(101.101.5.21~30) correctly,but when the clients' operarte system is centos 7,the ip it allocates is 101.101.5.21 for 5 times and 101.101.5.22~26,why does it happen?

Edited by Artem Boldariev