Multitenant 3 site using one database

am facing a serioous problem with version 15 where I set the the multitenant site. everything worked fine and the host is added for all site, the site_config.json has details for every site which is properly set with each site having a different database. the problem is, all these three site are using the first database even after them creating their site database during installation. I have searched and not fing a solution for this . Kindly any one point me to the right directio or could it be a bug in version 15.

Solved this by reboot my vps server. Everything works fine now.