recomendations stays

Hi, i played with the wordpress plugin and on the dashboard it gives Recomendations but even if i follow those and add them to .htaccess these recomendations stay there, what could i have missed?

it’s these 3

Security Header: X-XSS-Protection Missing
Security Header: X-Frame-Options
Security Header: X-Content-Type nosniff

i added to .htaccess in both admin and front:

<IfModule mod_headers.c>
Header set X-XSS-Protection “1; mode=block”
</IfModule>

<IfModule mod_headers.c>
Header always append X-Frame-Options SAMEORIGIN
</IfModule>

<IfModule mod_headers.c>
Header set X-Content-Type-Options nosniff
</IfModule>