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I'm sorry for the trouble caused to you.
I did test your form in my mobile device and it seems to work as expected. The conditions you have added in your form for "Cash / PayPal" seems to work fine.
Have you embedded your form in your web page? Please be noted that for your forms to work correctly in mobile device, we advice you to embed your form using its iFrame embed code. Please go ahead use your form's iFrame embed code in your web page and see if that solves your problem. The following guide should help you : http://www.jotform.com/help/148-Getting-the-Form-iFrame-Code
Hope this helps.
Do get back to us if the issue persists.
Thank you for your answer, I think my expression is not good, the conditions work fine in mobile same as you.
However, I don,t want when I go to form, the form will be auto select Pay by Paypal such as attacted photo, I want the form don't be chose everything, thanks a lot.
Thank you for explaining the issue.
I did test your form with its direct URL in my iPhone device and I am unable to replicate the issue you are having. The "Pay By" field option is not auto selected by default. Please check the screenshot below:
I would again like to ask if you have embedded your form in your web page. Please share the web page URL and we will take a look.
We will wait for your response.