Hello,

I saw the screenshot you attached.

The issue is not from our theme, it is from WordPress.

Please read the following articles for help:
https://stackoverflow.com/questions/38693992/notice-ob-end-flush-failed-to-send-buffer-of-zlib-output-compression-1-in
https://wordpress.org/support/topic/problems-ob_end_flush-failed-to-send-buffer-of-zlib-output-compression-0-2/

Regards.
Xtemos Studios