Hi,
please try to check database in your phpMyAdmin, database collation must be set to utf8.
Maybe this link can solve your problem:
https://wordpress.org/support/topic/special-characters-not-displaying-correctly
Also, open your wp-config.php file and set it to utf8 on line 31.
What text editor are you using? In Sublime text editor you can set encoding to UTF8, just go to File / Save with encoding / UTF8.
https://wordpress.org/support/topic/utf8-problem-incorrect-display-of-special-characters-e-e-a-a-o-etc
Let us know if you’re successful with that.
Kind regards