Authorized file update in GitLab Load Balance environment

Hi All,

We have a LB setup for 4 GitLab application servers. We have common url for gitlab using this LB setup. When a user logs into his account and copies ssh key, then only one server is reading it and getting key in Authorized file and other three servers are not getting the ssh key in their authorized file. What could be the reason for this? Do we have to configure anything? If anyone knows the solution please let me know. I appreciate your help