Hi,
I've seen a string error in file lib/classes/event/group_member_removed.php, in function get_description. I'm on Moodle 3.7.4, but suspect the problem is the same for all supported (and development) versions.
It should better be "The user with id... removed the user with id... from the group with " (and not "to").
Hope someone with direct access to the code can take care of this.
Séverin