This path:
http://wellhealthusa.com/new/contact.php does not provide any html source for me to view when I try it. You may be working on it and have it offline, perhaps?
In any event, you may try searching the recent posts for the problem with <table><form></form></table> tag ordering in your form. I seem to remember that problem was worse for some browsers/versions than for others. Probably if you just search for <table> you'll find a relevant post. Basically, if the form is inside the table, rather than the other way around, some browsers won't cooperate with reCAPTCHA.
That would be my first thought. Good luck.