Can not get response 1 of 2 tasks in docker swarm

Hello folks,
We using 1 manager and 2 worker nodes in docker swarm cluster and created a service with 2 replicas (2 tasks working in worker nodes). Then the message request had connection timeout 1 of 2 requests to one service. (other request 1 is working fine). What’s wrong with that setup?

Kernel Version: 4.18.0-305.el8.x86_64
Operating System: Red Hat Enterprise Linux 8.4 (Ootpa)
OSType: linux
Architecture: x86_64
Docker version 19.03.6
Docker-compose version 1.23.2