Fruitful theme conflict with Ninja Forms

Fruitful Theme CSS garbles the Ninja Forms info circles that provide field help in Ninja Forms. Details are below. Do you know what CSS in Fruitful Theme is causing this problem?

Details:

When Ninja Forms plugin version 3.2.4 is installed with Fruitful Theme version 3.5, the Ninja Forms info circles are garbled. Ninja Forms info circles are a black circle with white “i” and are a member of classes .fa, .fa-info-circle and .nf-help. These info circles provide Ninja Forms field help messages when the user hovers over them.

To “fix” the issue, I need to place the following in my Fruitful Child Theme style.css:

.fa-info-circle:before {
  display: none !important;
}

Do you know what Fruitful Theme CSS is interfering with the Ninja Form info circle style?

Thank you for your help.