Hi
The hamburger menu is not working as it should.
How do I fix it?

I have tried restoring the site back to before I updated various plugins. Turned off the various plugins. I switched theme and that helped.

It seems there is something happening with the theme mobile hamburger which makes the glitch. Sometimes the button is clickable and other times the hamburger mobile menu does not react at all.

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After some more research I discovered that the mobile logo partly covered the mobile hamburger menu. When or how it happened is a mystery. 

I adjusted the following CSS in the customizer:

/* Gives more space to mobile menu.*/
@media (max-width: 991px) {
.mobile-button .mobile-nav {
    font-size: 28px;
    z-index: 999999;
    padding-right: 15px;
      margin-right: 10px:
    }
    
    .header-content .container div.mobile-button i {
    font-weight: normal;
    font-size: 24px; (Bigger hamburger stripes.)
}
    
}

Uploading a mobile logo should by default NOT cover the hamburger logo. Do please fix this in your theme. Btw one of the things I researched as the theme, and I noticed that the client site is running version 2.1.9 (the newest theme).