Hi, Mahmoud.

Sorry for the delay

I can't seem to find any Amelia booking elements on your related page

And also there are no console errors in the browser developer console,

so it am not sure where to look in order to inspect the issue for you.

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Can you perhaps record your screen to show me how it looks from your end,

and if you can elaborate a bit more -

when you say  that the calendar doesn't appear on mobile devices anymore,

can you tell me what type of Amelia Booking Form it is,

is it the New Step 2.0 Form,  or maybe one of the Old Forms?

Can you show me a link to a page that should have this Form?

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Can you please check if the issue is only on mobile, or perhaps when you are logged as Admin, you can see it - but when not logged out,

   try from incognito browser -- can you see the issue?

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It might be a conflict, like Dominic said -  you can try this :

It is possible that this is some kind of a conflict between Amelia and another plugin on your site, or the current theme.

Can you please change the theme and see if the issue is resolved? 

If not, then please deactivate all other plugins except for our plugin, 

purge all cache of the site, then refresh the page where the issue is, and see if the issue stops. 

If it does, then start activating other plugins one by one, and after each activation refresh the page to see if the issue comes back. 

Once it does reoccur, you will have found the plugin causing the issue.

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Please let me know if you isolated the conflict;

If not, i can take a remote look for you.