A certain image doesn't show on mobile

Only one image doesn’t show only in the index page on mobile.
Page info is here. https://bestinx.me

This same image shows in https://bestinx.me/voting/about on the same mobile.

it had shown before using Cloudflare, btw.

I purged cache both of image file URL and URL above many times, but it didn’t work.
And I changed developing mode too. it didn’t work either.

Anyone has any idea?

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