Recurring problems with Framemarket

something seems to be constantly going wrong with the Framemarket theme, we’ve re-installed it and the same things keep happening. The folder is locked down, permissions are correct but the index.php file is constantly rewritten. I can send a ZIP file that includes two versions of the index.php files that are both messed up and lead to an inaccessible site-please just let me know where to send it. Thanks.