Repeatedly rewritten .htaccess

Hello.

Can you help me? I don't know, why is .htaccess repeatedly rewritten without my intervention to initialization version.
For example:
Content of the file after my last change (30.3.2016):
# BEGIN WordPress
# GEOIP povolenie pre krajiny
SETENVIF GEOIP_COUNTRY_CODE US POVOLENE
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress

The same file today. (without my intervention)

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress

I asked our provider about it, but he did not find anything, all settings are correct.
Can you advise me a solution to this serious problem? Does it relate with wordpress settings?

Thank you very much for your answer.

Viera, Mr.Baranek colleague