Hello,
1) This issue as a rule is caused by a cache plugin that does not separate mobile and desktop caches. Could you, please, provide us access to your Dashboard with admin permissions to allow us to check the list of plugins that you use and cache plugin settings to help you?
2) Provide us with FTP access to your site to check the issue in more detail. Do you use any server cache or CDN?
Regards
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.