Zlib Compression is enabled
Due to the pattern i noticed, this is likely caused by the PHP variable “zlib.output_compression” being enabled.
To disable it, try editing one of these:
php_flag zlib.output_compression Off
SSL is not properly setup
If your site is using a SSL certificate, try accessing WP backend > Settings and make sure the Site Address and WordPress address URL’s both have “https” inside.
Upgrade PHP version
Please make sure you’re running a recent version of PHP like 7.3+ .