502 Error showing from my device but not from the rest of the world

I have recently added my site ( a1store.tk ) to cloud flare . But after this I can’t access to my site using the address provided from my device.
Whenever I hit to this address cloud flare shows that My Device: OK , cloud flare Singapore: OK , Host: Bad Gateway.
But when I test: is my website up? From various websites such as https://www.isitdownrightnow.com/ https://downforeveryoneorjustme.com/ Free Website Down Checker | Is Site Down For Everyone ᐈ Free Website Uptime Checker - Easily Check Your Website Availability Status - IsItWP https://gtmetrix.com/
I find my server is up , website is live and fully accessible.
Then what’s the problem. I find all settings are correct. Do you have any suggestions?

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