Sorry, I can't reproduce what you show in your snapshot.

> Emacs  : GNU Emacs 26.0.50.1 (i686-pc-linux-gnu, GTK+ Version 3.10.8)
>  of 2016-10-23
> current state:
> ==============
> (setq
>  AUCTeX-date "2017-07-25"
>  window-system 'x
>  LaTeX-version "2e"
>  TeX-style-path '("/home/oub/emacs/site-lisp/packages/auctex-git/auctex/style/"
>                   "/home/oub/ALLES/HGs/tex/sty/auto" "auto" "style")

Maybe you update your AUCTeX to latest version and remove your additions
to `TeX-style-path' for testing.

Best, Arash