Radio buttons go haywire in mobile screen


I have made a calculator at indxno5
It has no problems regarding data. but when viewed on mobile the radio buttons go hay wire i. e on a larger screen these buttons are in line but in mobile they appear as per the screen shot attached.
Moreover, in IPad in landscape mode their appearance is in order but in portrait view they appear at wrong position as in screen shot.
I need help to set it right.
I have a very limited knowledge of CSS.