Hi, thank you for purchasing our theme
Please login wp-admin, go to Aside / General Settings / Custom Css
Paste the style code to Custom Css:

.brick-with-img .brick-link-gray .brick-hover-mask.brick-hover {
    z-index: 11;
}

Cheers!
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Please update the custom css as:

.brick-with-img .brick-link-gray .brick-hover-mask.brick-hover {
    z-index: 11;
}
.brick-link-gray:hover .grayscale {
  filter: url("data:image/svg+xml;utf8,<svg xmlns=\'http://www.w3.org/2000/svg\'><filter id=\'grayscale\'><feColorMatrix type=\'matrix\' values=\'1 0 0 0 0, 0 1 0 0 0, 0 0 1 0 0, 0 0 0 1 0\'/></filter></svg>#grayscale");
  -webkit-filter: grayscale(0%);
  -webkit-transform: scale(1.2);
   -moz-transform: scale(1.2);
   -o-transform: scale(1.2);
   -ms-transform: scale(1.2);
   transform: scale(1.2);
}
.brick-with-img .brick-hover:hover ~ .brick-content img, .isotope-liquid-list .hover-effect .brick-hover:hover img {
    -webkit-transform: scale(1.2);
    -moz-transform: scale(1.2);
    -o-transform: scale(1.2);
    -ms-transform: scale(1.2);
    transform: scale(1.2); 
    opacity: .6;
}