frontend form for relationships acting differently on different pages

I have a relationship between two CPTs - "bookings" & "enquiries".

I have a frontend submission form on my bookings page to create a relationship to an enquiry - the field is searchable and lists all the enquiries.

On my enquiries page I also have a frontend submission form creating a relationship to a booking - this field isn't searchable and only shows the last 10 bookings rather than all of them.

Ive followed the same procedure for both so is there a reason why this could be?

heres the code i used on the bookings page - the one that worked well...
do_shortcode( '[mb_frontend_form post_id="current" id="enquiry-booking_relationships_from" ajax="true" submit_button="Save Links" confirmation="Done!" redirect="'.$urlRed.'"]' );

and here's the code i used on the enquiries page that only shows 10 entries and isnt searchable...

do_shortcode( '[mb_frontend_form post_id="current" id="enquiry-booking_relationships_to" ajax="true" submit_button="Save Links" confirmation="Done!" redirect="'.$urlRed.'"]' );