I'm a total noob looking for a bit of help. Hopefully someone out there might find this query basic and be able to provide an answer

I have been developing a form for a website. I found a nice css for it online and it mostly works fine. However, there is 1 issue which is eluding me. You can view the page here:
http://110.232.141.122/~acorwate/index. ... Section-73
The form looks kind of ok on a screen, however when you view on a mobile the 'Subdivision Type *' and 'Development Type' radio buttons don't drop down below the label like they do on other fields. I've been banging my head against a wall trying to fix it but without any luck. Anyone have any ideas?
Thanks in advance