Hi Shabixh,
Thanks for using Caldera Forms. Caldera Forms is responsive by default, so if your forms are not mobile-responsive, that tells me your theme is possibly enacting some sort of strict styling. I’d like to help, but we need to narrow down exactly what the problem is. If we can isolate the cause, we can probably fix it. Have you tried disabling all of your other plugins and switching to the default theme and then re-submitting the form?
If that works, then we can be sure this is not a bug with Caldera Forms or an issue with your form setup and look at where the conflict is. If it does not resolve the issue, then we will know the other factors are unrelated and can look at your form.
I would recommend doing this test on a staging site. If your host does not provide staging sites, you should really consider a managed WordPress host that provides this service, such as SiteGround (https://www.siteground.com/recommended?referrer_id=7732003), that offers this feature. Please do note that while that is an affiliate link, we are big fans of their product and are active users ourselves.
