doesn’t work with WP fatest cache plugin in Chinese wp site

The site test.xiapeter.com is the one that I set up to show you the problem.

If you browse it with an iPhone 5C – the hamburger menu loses its format, as shown by this screenshot: https://imgur.com/a/2HRlyP4

The problem is gone if I deactivate WP Fastest Cache.

It is a strange problem:

1. it works fine with WP Fastest Cache on my English site: https://flyingdomain.com/support/

2. it doesn’t work with WP Fastest Cache on my Chinese site: http://cn.flyingdomain.com/%E6%94%AF%E6%8C%81/

So I set up test.xiapeter.com for a test:

1. I switched the theme and the problem did not go – it is not a theme issue.

2. I deactivated each plugin one by one and I don’t find a problem with other plugins.

Conclusion: the plugin doesnt’ work with WP Fastest Cache on a Chinese WP site (while it has no problem with WP Fasted Cache on an English site).

If you need the login to the test site, let me know.

Thanks.

The page I need help with: [log in to see the link]