conditions on form inconsistent

I have conditions set up on the following form to show/hide certain fields, even on javascript enabled browsers sometimes the conditions work and then other times they don't, it's inconsistent which makes it difficult to work out what the problem is

http://www.riverinatradies.com.au/list-your-business-albury

I see that the conditions set on your JotForm seems to be working fine at my end. However, I see that your JotForm is embedded using normal embedded method on your website which may be conflicting with other scripts on your website. This may be resulting in the inconsistency of conditions on some browsers.  Please re-embed your JotForm on the website using iframe method by getting the form iframe code following the guide below :

http://www.jotform.com/help/148-Getting-the-Form-iFrame-Code 

Please let us know if the issue still persists after embedding your JotForm using iframe method. We will be happy to look into this issue further.

Thank you!

Yes they seem to work fine on my end too, but recently someone completed the form where all of the fields were displayed. I have a noscript warning for browsers that don't have javascript enabled so that can't be the problem.

Also I'm not too keen on the iframe embed as the height of the form has to be set which leaves lots of empty white space at the bottom of the form which looks awful, especially if one of the conditions are selected where very few fields are displayed.

Is there any other options?