Accordion Title Text Not Showing Up on Mobile

Hello, all! There's something strange going on with an accordion I have on a page, and I can't seem to figure out what is going on. Hoping someone can help!

The accordion titles are not showing up on my mobile (checked both Safari and Chrome), though they do show up when I'm looking at the mobile size on my desktop via inspect (though the text is overlapped and not spaced correctly). The accordion content is showing up just fine.

Page url: https://www.wholeheartedcertification.com/

FAQ Accordion section is towards the bottom of the page.  I've attached some images to show what I'm seeing inside the editor and also on my phone.

Any insight would be very much appreciated!

Thank you,
Nikole

Thank you so much for your reply @tuanphan  I'm not sure why it wasn't showing up but it is now? Anyhow, I appreciate your response!