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Hello.
Its most probably that you are having some JavaScript error at that page. Please recheck your page for any JavaScript errors (usually for see what JavaScript error you have you need to press Ctrl {+} Shift {+} J for showing browser console) and try to fix them.
You can check for the most common issues on the FAQ page https://wpbookingcalendar.com/faq/ at the troubleshooting section.
You can also try to deactivate one by one all your active plugins at the WordPress > Plugins menu. Then retest it again.
If its not help, please deactivate your active theme and active the default WordPress theme. And then retest it again. May be there exist some conflict with some active plugin or actual theme and just need to find the reason of that issue.
Kind Regards.

Hello.
Please send screenshot of this issue.
Also please recheck your error.log in your server configuration, about any relative errors. If you can not find error.log file, please contact support of your hosting company about helping in finding this file.
Thank you.

Hello.
Please check more here https://wpbookingcalendar.com/faq/select-multiple-times/

Hello.
Its most probably that you are having some JavaScript error at that page. Please recheck your page for any JavaScript errors (usually for see what JavaScript error you have you need to press Ctrl {+} Shift {+} J for showing browser console) and try to fix them.
Please send info about that error or screenshot of that error, then we can investigate about this.
Thank you.

Hello.
This issue because of the CSS conflict with your actual theme. To resolve this issue, please make this fix.
Please open this file https://islandcabin.nl/wp-content/plugins/elementor/assets/css/frontend.min.css

( you can check how to edit files in WordPress menu in this article https://wpbookingcalendar.com/faq/how-edit-file-in-wp-menu/ )

then add this code to the bottom of this file:

div.elementor-widget {
    position: initial;
}

Please do not forget to clear the browser cache before testing these changes.

Kind Regards.

Hello.
1) I do not see the calendar at your page here https://lapalma.pl/rezerwacje-karo/ because there is exist some JavaScript errors:

Uncaught TypeError: window.wp is undefined
    <anonymous> https://lapalma.pl/wp-content/cache/wpfc-minified/3lmf3g0/htasp.js:22

This issue because of using the cache plugin. Please recheck for any cache plugins, like “WP Super Cache”, “WP Fastest Cache” or “W3 Total Cache”. If you are using someone, please deactivate it or add the exception to the page with booking form for do not cache this page(s).

Also please note instead of this shortcode,
[booking nummonths=2 options='{calendar months_num_in_row=1 width=256px cell_height=30px}’]
please use this one:

[booking nummonths=2 options='{calendar months_num_in_row=1 width=256px cell_height=30px}']

Last quote symbol (’) is not correct, that can generate issue of not correctly showing size of calendar. Correct one is (').

After that we can check what issue do you have with right side aligning.

Relative form styling, it’s seems that the your theme CSS apply to the booking form styles, and you see such style of the booking form.
Additional configuration of the booking form styles you can do inside of the ../booking/css/client.css file.
If you define what exactly need to change we can help you with this.

2) Relative looking of booking admin panel. You can check how is looking like the booking admin panel here to be sure that there was not any conflict issues: https://personal.wpbookingcalendar.com/admin-panel/

Kind Regards.

Please contact support of Booking Calendar here support @ wpbookingcalendar.com

Please note, this forum is only about the support Booking Calendar Free version. If you will have any questions about the paid versions, then contact here https://wpbookingcalendar.com/contact/

Hello.
Unfortunately it’s does not possible in actual versions of Booking Calendar. Sorry.