[Defender] Defender plugin being replaced with another one

Hi,

Today I logged in to one of my clients` websites to find a very weird issue. The WPMU DEV defender plugin had been deactivated, deleted and replaced by this plugin: https://wordpress.org/plugins/wp-defender/

I had two-factor authentication setup and masked the login directory. I am also the only person who has access to the websites and to the control panel of the hosting account.

Has this happened to anybody else?

It doesn`t make ANY sense. I am only using the DIVI theme and WPMU DEV plugins. I am not sure where to go from here. I am happy to provide you with more information