Blog Thumbnail Photo Being Cut Off

Site URL: https://giraffe-fennel-r66f.squarespace.com/

On my testimonial slider, that I'm pulling from blog posts, my thumbnail image is being cut off. I've used custom code to style this.

The images used are perfect squares. Sometimes the images are showing properly but most of the time they're cut off on the top and bottom. 

Site password: field

Custom code I used: 
#block-yui_3_17_2_1_1620082494249_5063 .summary-thumbnail {
  overflow: visible !important;
  border: none;
}
#block-yui_3_17_2_1_1620082494249_5063 .summary-item-list {
  pointer-events: none;
}
#block-yui_3_17_2_1_1620082494249_5063 .summary-item-list img {
  border-radius: 100% !important;
  height: 150px !important;
  width: 150px !important;
}
#block-yui_3_17_2_1_1620082494249_5063 .summary-thumbnail-outer-container {
  height: 150px !important;
  width: 150px !important;
  margin: 0 auto;
}
#block-yui_3_17_2_1_1620082494249_5063 .summary-title {
  margin-top: 20px !important;
  font-size: 1rem !important;
  font-family: Tenez;
  text-transform: uppercase;
  font-size: 25px !important;
  text-align: center !important;
  pointer-events: none;
}
#block-yui_3_17_2_1_1620082494249_5063 .summary-excerpt {
  margin-top: 30px !important;
}
#block-yui_3_17_2_1_1620082494249_5063 .summary-excerpt p {
  font-size: 20px !important;
  line-height: 1.6em !important;
  text-align: center !important;
}
#block-yui_3_17_2_1_1620082494249_5063 .sqs-gallery-design-carousel .sqs-gallery-controls .next:before {
  color: #ffffff !important;
  font-weight: 700 !important;
  font-size: 1.5rem !important;
}
#block-yui_3_17_2_1_1620082494249_5063 .sqs-gallery-design-carousel .sqs-gallery-controls .previous:before {
  font-weight: 700 !important;
  font-size: 1.5rem !important;
}
#block-yui_3_17_2_1_1618857549248_13420 .sqs-gallery-design-carousel .sqs-gallery-controls {
  width: 100%;
  padding-right: 30px;
}

Thanks for any assistance! 

Don't remove any code in above code

Add this to Design > Custom CSS > then save & reload the site

/* Fix summary images */
#block-yui_3_17_2_1_1620082494249_5063 .summary-item-list img {
    border-radius: 100% !important;
    height: 150px !important;
    width: 150px !important;
    top: 0 !important;
}
#block-yui_3_17_2_1_1620082494249_5063 .summary-thumbnail {
    overflow: visible !important;
    border: none;
    padding-bottom: 100% !important;
}