[ad_1]
Hello.
1) Probably it’s because of conflict with some other plugin or actual theme.
Please try to deactivate one by one all your active plugins at the WordPress > Plugins menu and make testing after each plugin deactivation.
If it does not help, please deactivate all your plugins and active the default WordPress theme. And then retest it again.
We just need to find the reason for this issue.
Otherwise please send the link to your page with booking form, where you are having the issue.
2) Please note, this forum is only about the support of Booking Calendar Free version. If you will have any questions about the paid version, then contact here
Kind Regards.