Wordpress circular redirect ERR_TOO_MANY_REDIRECTS, why?

Question

htaccess

https://(my_site)/wp-content/plugins/really-simpl...
The page is not available. senspe.dekun.ru redirected too many times.
Delete cookies.
ERR_TOO_MANY_REDIRECTS Debug

log generated by really-simple-ssl:
General
Plugin version: 3.3.5
SSL certificate is valid
SSL is enabled

Options
* Mixed content fixer
* WordPress redirect

Server information
Server: apache
SSL Type: SERVER-HTTPS-ON

Detecting configuration

SSL Configuration
testing htaccess rules...
test page url, enter in browser to check manually: https://(mysite)/wp-content/plugins/really-simple...
htaccess rules test failed with error: Too many redirects
checking if .htaccess can or should be edited...
.htaccess does not contain default Really Simple SSL redirect
retrieving redirect rules
converting siteurl and homeurl to https
Mixed content fixer successfully detected

Constants
No constants defined

.htaccess
# BEGIN WordPress
# The directives (strings) between `BEGIN WordPress` and `END WordPress`
# are created automatically and can only be changed through WordPress filters.
# Manual changes between these markers will be overwritten.

RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]

# END WordPress
# php -- BEGIN cPanel-generated handler, do not edit
# Set the “ea-php54” package as the default “PHP” programming language.

AddType application/x-httpd-ea-php54 .php .php5 .phtml

# php -- END cPanel-generated handler, do not edit

Answer 1

RewriteRule ^index\.php$ - [L]
remove this