Untrue error

Hello, I'd like to report that the Nu HTML Checker marked a part of my code
(which includes the Bootstrap 5 framework) as containing a stray </hr> end
tag, while the code itself has both <hr> and </hr>. Is there a reason why
it marked it in the first place?
Screenshots of the error itself and the part of the code attached.[image:
telegram-cloud-photo-size-4-5873137842370841372-y.jpg][image:
telegram-cloud-photo-size-4-5873137842370841373-x.jpg]