Problem of correct text display

[Vladimir_Sergeevich_Domanin]

Good day!
What in the current version may be the reasons for the incorrect display of the text?Problems with the Cyrillic.

confluence version 6.15.7

[Vladimir_Sergeevich_Domanin]

Some additional information:

Use mysql database, version 5.6.44
character_set_database utf-8
collation_database utf8_bin

confluence general settings, encoding utf-8

[UPDATE 25_07_2019] 

in this example
I am using mysql database server.

[mysqld]
init_connect=‘SET collation_connection = utf8_unicode_ci’
character-set-server = utf8
collation-server = utf8_unicode_ci

[client]
default-character-set = utf8

After applying all the options and restarting the mysql server, you can use the SHOW VARIABLES LIKE 'char%' and SHOW VARIABLES LIKE 'collation%' commands to check the settings;

Be sure to consider the version installed by mysql, there are differences in the parameters.