mysql replica is running but the data not updated

[amna sayed]

I have 2 MySQL replicas on 2 Linux servers

Server1 contain masterA DB1& DB2 , slaveB DB3 and some tables of DB4

Server2 Contain masterB DB3 and DB4 , slaveA some tables of DB1/DB2

Replic A staus is running and data is syncing but for Replica B status is running but data not sync specially MyIsam tables.

it's so wired issue the replications look like are running and no errors but some some tables not updated, How can i solve this issue?

Those the my.cnf files for 2 servers server1 my.cnf

server-id = 1
##Master info##
log-bin=mysql-bin
binlog_format=ROW
expire_logs_days = 3
max_binlog_size = 100M
##Slave info##
relay_log=relay-log
replicate-do-db=DB3
replicate-wild-do-table=DB4.tb1
replicate-wild-do-table=DB4.tb2
replicate-wild-do-table=DB4.tb3
Server2 my.cnf

server-id=3
# Master Info #
log-bin=mysql-bin
binlog_format=ROW
expire_logs_days = 30
max_binlog_size = 100M
##Slave Info##
relay_log=relay-log
replicate-wild-do-table=DB1.tb1
replicate-wild-do-table=DB1.tb2
replicate-wild-do-table=DB1.tb3
replicate-wild-do-table=DB1.tb4
replicate-wild-do-table=DB2.tb1
replicate-wild-do-table=DB2.tb2