Unable to activate GZIP Compression. Deflate is active in htaccess

HI,
I am trying to activate GZIP Compression, I am getting an error message: "- Your server may not have the "deflate" module enabled (mod_deflate for Apache, ngx_http_gzip_module for NGINX)

there is actually a deflate rule set up and running though...

Please can you advise,
Thanks in advance