Narrow this issue down by testing with the default Pocket IE on your device. If you see the same thing without using the Wavelink Industrial Browser then you know the issue is with IE. If everything works correctly in IE then you know it is a problem with the Wavelink Industrial Browser. Keep in mind that Wavelink Industrial Browser runs on top of pocket IE so they should behave the same.
I can confirm now that it is an IE issue, specifically with the User Agent. I get this issue within IE if I have the user agent set to Pocket PC or Windows CE. If I change it to 'Default (same as Windows XP)' I get no issue, within both IE and Industrial Browser. Unfortunately I need to run a mobile version of the site rather than the full so I have have to investigate my IE settings further.
Thanks for your help.