Form field display issue?

I have three separate fields for a user to enter their phone number, and for some reason each field automatically breaks to a new line. (I tried adding spaces in between the hyphens, but no luck.)

Is there any way to change it so that all three fields are on one line? I know I could just alter it to have one field instead, but I’d like to make sure people put in an area code.

Here’s the page:
https://trullingerphotography.com/blog/contact/