require 'use-package: cannot load file on second time as per flycheck

Question

For my require 'use-package, I'm getting cannot load file error but I really don't understand why.

In my ~/.emacs.d/init.el file, at the very top, I have

(eval-when-compile
  (require 'use-package))

(load (expand-file-name
         "load-path" (file-name-directory load-file-name)) nil t)
(add-to-list 'load-path (expand-file-name "lisp" user-emacs-directory))
(load-library "init-emacs00")

However, in my init-emacs00 file, at the very top, I too have

(eval-when-compile
  (require 'use-package))

What strange is that my ~/.emacs.d/init.el file doesn't have such error, while my init-emacs00.el file does, as per flycheck:

It seems my above adding "lisp" into load-path has done something bad, but I don't know elisp except copying from working code thus I don't know how to fix the problem, I just want to add ~/.emacs.d/lisp/ to my load-path, where all my elisp resides, including my init-emacs00.el file.

That means, although it seems my above adding "lisp" is the problem, but they (all my elisp files) just load fine.

Also, I tried to add ~/.emacs.d/elpa/ to load-path myself, where the use-package is installed:

(eval-when-compile
  (add-to-list 'load-path "~/.emacs.d/elpa/")
  (require 'use-package))

but as we can see, that isn't working either.

UPDATE:

Thanks to db48x's help on how to find the current value of the variable, I found that,

• user-emacs-directory’s value is "~/.emacs.d/"
• and my load-path value already contains ~/.emacs.d/elpa/ and ~/.emacs.d/elpa/use-package-20210207.1926, when I took the above screenshots.

which makes the above flycheck warning very confusing.