vimdiff confuses lines

[Rostislav]

I try to see diff of two files in my Ubuntu 20.04.

$ vimdiff outlog_20201020082321-head.log outlog_20201020084056-head.log

The diff matches wrong lines and highlights them strangely..
Reproducible with removed ~/.vimrc and ~/.vim.

$ vim --version
VIM - Vi IMproved 8.1 (2018 May 18, compiled Apr 15 2020 06:40:31)
Included patches: 1-2269
Modified by <email address hidden>
Compiled by <email address hidden>
Huge version without GUI. Features included (+) or not (-):
+acl -farsi -mouse_sysmouse -tag_any_white
+arabic +file_in_path +mouse_urxvt -tcl
+autocmd +find_in_path +mouse_xterm +termguicolors
+autochdir +float +multi_byte +terminal
-autoservername +folding +multi_lang +terminfo
-balloon_eval -footer -mzscheme +termresponse
+balloon_eval_term +fork() +netbeans_intg +textobjects
-browse +gettext +num64 +textprop
++builtin_terms -hangul_input +packages +timers
+byte_offset +iconv +path_extra +title
+channel +insert_expand -perl -toolbar
+cindent +job +persistent_undo +user_commands
-clientserver +jumplist +postscript +vartabs
-clipboard +keymap +printer +vertsplit
+cmdline_compl +lambda +profile +virtualedit
+cmdline_hist +langmap -python +visual
+cmdline_info +libcall +python3 +visualextra
+comments +linebreak +quickfix +viminfo
+conceal +lispindent +reltime +vreplace
+cryptv +listcmds +rightleft +wildignore
+cscope +localmap -ruby +wildmenu
+cursorbind -lua +scrollbind +windows
+cursorshape +menu +signs +writebackup
+dialog_con +mksession +smartindent -X11
+diff +modify_fname +sound -xfontset
+digraphs +mouse +spell -xim
-dnd -mouseshape +startuptime -xpm
-ebcdic +mouse_dec +statusline -xsmp
+emacs_tags +mouse_gpm -sun_workshop -xterm_clipboard
+eval -mouse_jsbterm +syntax -xterm_save
+ex_extra +mouse_netterm +tag_binary
+extra_search +mouse_sgr -tag_old_static
   system vimrc file: "$VIM/vimrc"
     user vimrc file: "$HOME/.vimrc"
 2nd user vimrc file: "~/.vim/vimrc"
      user exrc file: "$HOME/.exrc"
       defaults file: "$VIMRUNTIME/defaults.vim"
  fall-back for $VIM: "/usr/share/vim"
Compilation: gcc -c -I. -Iproto -DHAVE_CONFIG_H -Wdate-time -g -O2 -fdebug-prefix-map=/build/vim-iU6mZD/vim-8.1.2269=. -fstack-protector-strong -Wformat -Werror=format-security -D_REENTRANT -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1
Linking: gcc -Wl,-Bsymbolic-functions -Wl,-z,relro -Wl,-z,now -Wl,--as-needed -o vim -lm -ltinfo -lnsl -lselinux -lcanberra -lacl -lattr -lgpm -ldl -L/usr/lib/python3.8/config-3.8-x86_64-linux-gnu -lpython3.8 -lcrypt -lpthread -ldl -lutil -lm -lm

Any clue? Thank you!

[Rostislav (rostislav-kouznetsov)]

Here are the files.

Thnk you!