Every time Blogvi theme Update my custom templates disappear

Hello peregrinethemes Admins, every time I update the Blogvi theme, my custom templates disappear. This issue has occurred twice now. I have manually uploaded the custom template PHP pages. on wp-content> themes > Blogvi > my custom temeplate.php and they Some of my files are being deleted or disappearing.

I have already contacted my hosting provider, and they claim it is not their error. I have also checked my backups, but the files are not there either. It seems that they are simply vanishing. Could you please assist me in resolving this issue?