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I did check your form in safari browser on my iPhone device and the range widget seems to be displayed correctly. Please check the screenshot below:
Please let us know with which mobile device and browser you are having this issue with, we will take a look.
We will wait for your response.
I was referring to the "number range widget"you are showing the fancy slider which is not responsive as your screen shot shows
I can see the issue on Range widget on your jotform http://www.jotform.us/form/43604630462146
Can please try the following modifications and check if it fixes the issue.
#1. In Preferences, set to NO the Form Responsive option
#2. Enable Mobile Responsive Form instead using the Form Designer
This process fixes the issue on my test jotform http://www.jotformpro.com/form/43616757082965
Please try also on your jotform. Inform us if issue persist.