Lightbox form unusable on iPhone / iPad

Hi, have a lightbox on a development site and works fine in browser but when on an iPhone or iPad when you click into the fields the form vanished then re-appears in a different position, very frustrating. Can you check your end please and advise on best way to fix?

If you click the link give and click 'To Sell' or To 'Rent' in the 'How much is my property worth?' box

Hello MAps1,

Please be noted that Feedback and Lightbox embed codes are not optimized for mobile devices. You may like to embed your form using "Pop-up" embed code. Please check the screenshot below:

Hope this helps.

Do get back to us if you have any questions.

Thank you!