Mobile Usability issues reported by Google Search Console

Hi, We received an email from Google reporting issues on this site:

• Clickable elements too close together
• Content wider than screen

While looking in the Dqshboard to see if I could find any sight of this issue I also ran across this notice:

A PHP session was created by a session_start() function call. This interferes with REST API and loopback requests. The session should be closed by session_write_close() before making any HTTP requests.

Can you shed any light on these issues? Thank you