Hello Mr. @vmarko
Thanks.
I was trying to solve this problem for almost 5 days,
Now It was INDEED that double compression.
Thanks for your Assistance.
My Issue is Resolved.
Hello, Mr. @vmarko
Like you said I did disabled Gzip Compression in that Browser section (for css and Js),
And It works
Will It have any Issue on performance of my site?
and also I will update you As I will test It when I use/enable Gzip in external Nginx config also Brotli.
thanks for quick Fix.