you need to open your SVG icons file with some editor like Sublime Text or default system text editor and add width=”31″ height=”40″ attributes to your <svg> tag like it is shown: https://gyazo.com/8ab7cb9db3dc3f6471aca9d1f480f566
Then you will need to re-upload your icons in WordPress Dashboard.
Please insert the site admin access into the Private content below the message area. We will take a closer look at the case.
Please, confirm the permission for plugins deactivation, and switching to the parent theme. As soon as we complete the testing we will enable all back, however, the site would be without plugins for 15-20 min. You would better make the full backup of your site.
In addition, provide the page URL with the problem.