if you go to
Settings -> Courses -> Add/Edit courses
the html code of the table you get starts with
<table class="generalbox...

IMO, this is a bug because the code should be

<table class="generaltable...

Tables styled with the class "generalbox" look different from tables classified as "generaltable" even if them both belong to site administration.

I am saying that what I expect from moodle is that
the table in Settings -> Courses -> Add/Edit courses
and the table in Settings -> Reports -> Comments
as well as the table user for user enrollments
should share the same class.

Please do not reply me telling that I am free to give to two different classes the same rules!
Please do not force theme developers to patch something that can be fixed in the code!