Hello Everybody,
{ After clearing cache many times and turn off cache, everything is OK now. Turn on cache again, seems to be OK, also. Thank for your reading! }
{ 2 days after from OK, index.php/ re-emerges, what happened? }
{ December 6th, 2017: I did not touch anything, but in URLs views's pages are OK, but main menu links are wrong (OK before) }
My website ( superthinlabs dot com ): Drupal 8.4.2 , bartik theme, Apache 2.4, mod rewrite on.