iPhone portrait submit button missing.

Hi,
You can test your site disabling all plugins, Maybe any plugin causing this problem. normally it should work just fine on iphone. However, if your problem is not solve by deactivating plugins then you can change your media query. It does not look perfect for iphone. Please use the following media query to target iphone 4 and 5 in portrait mode only as you have got problem in portrait mode.

/* iPhone 4 ----------- */
@media
only screen and (-webkit-min-device-pixel-ratio : 1.5) and (orientation : portrait),
only screen and (min-device-pixel-ratio : 1.5) and (orientation : portrait) {
/* Styles for iphone 4 goes here */
}


/* iPhone 5 ----------- */
@media only screen and (min-device-width: 640px) and 
  (max-device-width: 1136px) and
  (-webkit-min-device-pixel-ratio: 2) and (orientation : portrait) {
    /* style for iPhone 5 only on portrait mode */
}

I hope this will fix your problem.
thanks,
Kamal

Hello Aaron,
You should put the above css in appearance>editor>style.css of child theme. and only putting the above code will not have any effect. These are just media queries for targeting iPhones for activating specific css style for them. Your css code should go after the comment line in the above codes. and it would be great if you could give a link to your site to test. Normally, there should not be any problem on iphones. and also try to clear browser caches and cookies after deactivating all plugins to test your problem.
Thanks,
Kamal