We have a totally custom theme that we have built in house, recently the WordPress updater has started saying the theme is out of date.
When I investigated this supposed update it links me to a similarly named theme in the WordPress theme directory but one that is not developed by us.
We normally update our themes manually either through the filesystem or FTP. We have never submitted our theme to the WordPress directory nor do we have a mechanism or infrastructure to allow our themes to "phone home" to check for updates.
What is going on here? How do I stop it misreporting the theme update? I really want to stop this behaviour to prevent an over eager customer trying to update the theme to this one and breaking their site.