Conditional Logic [Show/Hide]; I want to show only one field, but all are showing instead.

On the form there is a condition set that if 'yes' is selected on airport transfers then a number of other fields displays, however all the fields are displaying anyway.

I have checked your form and I can see the condition for the field "Airport Transfers required *" is set to show the fields: 

Select Airport *

Flight Arrival *

Number Of Passengers *

Flight Number *

Flight Departure *

Here is a screenshot of your condition, where there is a duplicated statement too:

I have tested on the embedded form and with the direct link to your form, could you please provide us more details about your issue? 

Please let us know, we will be glad to take other look to your form.