Reservation page redirect with no error messages

This is a huge one.
Top tight button "Reservation" leads to page with all rooms, rates etc.
As soon as I "Select" one, a new drop menu comes in place asking to select dates.
As soon as I chose dates that do not conform with the minimum allowed length of stay, instead of getting a message about the minimum allowed length of stay, I just come back to the initial "Reservation" page. No message, nothing to aid the user to do the right selection...
In other words, it's looping.
I have also chosen to link the "Book Now" button on main page to this page and well enough I am now in a "dead end" situation.
Can someone please give me a workaround?

Thank you.

Hi,

What is your current Solidres version?

You should also provide us your website info so that we can check it easier.

Regards,

Hello and thanks for the reply,
I have 2.8.3.
The site isn't yet "live".

Hi,

You should switch your site to default Joomla template and try again.

If this issue still persist, please provide us your website URL so that we can debug it further for you.

Regards,

Thanks for the reply.
This is the site:
bestathensapartment.com/

Hi,

We've checked and it seems to work fine for us (screenshot).

Regards,